【正文】 udents is more than 70 percent,and the situation is continuously worsening, he Zhu, director with the China Youth Development Service Center, said long hours ofstudy, lack of exercise, especially outdoor activities, and attachment to electronic screen aresome of the top reasons behind the widespread myopia problems, and the increase ofyounger patients, although China has made great progress in improving the hardwarefacilities and lighting conditions in said he hopes the survey will alert people on the threatening situation, and also helpmedical experts to better guideline parents and children39。s behaviors to care for eyes, basedon the timely and factual statistics the survey collecte series of followup events will also be held in six cities, including Jinan in Shandongprovince, and Changsha in Hunan province, to educate people on how to care for eyes afterthe survey started. More and more Chinese are jogging to get and stay fit. Most joggers will run alone, but some will jog with friends or even coaches. The Beijing Olympic Forest Park is one of the most popular spots. It is packed with runners in the afternoon, usually after work, and at weekends. Jogging after a whole day39。s work can be a way to unwind. It is true for He Wenjun, whose workplace is right near the forest park. She discovered her athletic aptitude at the age of seven, when she began playing tennis. Then she turned to jogging, and she has persevered with it for 10 years. I e to jog almost every day after work, whenever I have time. I think jogging is good for my health. And for me, a girl, it helps me to achieve to eternal goal, to keep slim, He said. He says she prefers jogging alone, so she can focus better. She loves jogging, even during Beijing39。s smoggy days. If the smog is severe, I39。ll hold off jogging for a while. But if I really want to get away from work, I39。ll wear a mask, or just ignore the smog and go on jogging, 29 she said. For those who are not so athletic, jogging also has its attractions. Wu Houbin started roughly two years ago, when he was severely obese. Within two months, his weight dropped from 82 kilograms to 64 kilograms. The success helped him recover health, and he has made friends. Jogging does not require speed, but stamina. If you want to stick to the game, you need to take it as a mission, a habit, and then eventually a hobby, Wu said. But persevering with jogging is not always easy. Jogging is beneficial for heartlung function, and the skeletal system, but doctors say improper technique damages the joints, especially the knees and ankles. Excessive jogging wears down the body, and harms one39。s health. Poor technique harms the muscles and skeleton, and can cause secondary injures. And, jogging in a bad environment can cause circulation problems, said Lu Zhiyong, attending doctor, Sports Hospital, General Admin. of . Lu has some tips for joggers, and those who are thinking of taking it says people sh ould first evaluate their physical condition, to decide the amount and type of exercise, and jogging in the open air is better We are floating on top of a frozen margarita. That39。s how our shipboard naturalist John Fonseca describes the slushy ice that the Silver Explorer is plowing through as we enter Greenland39。s Prince Christian Sound, named after a longago Danish royal who became King Christian VIII. In the distance, the water surface is a smooth sheet of darkgreen jade under the overcast sky. The cruise ship suddenly feels larger as we slip into the narrow passage of the sound. Bigger and bigger chunks of sea ice float by, like huge gobs of whipped cream dropped on the surface by some quirky Norse god. The sculpted forms pass so close, it39。s tempting to stretch out a finger for a poke and a taste. At its base, the rocky shore on each side is often green with moss and lichen. But it quickly bees less hospitable and even forbidding, its glacierscarred face climbing steeply until disappearing into low, filmy clouds. Some patches of ice have lingered since last winter, though the August sun is converting the most exposed into waterfalls that trickle merrily into the brilliant sea. Leaning on the observation deck at the ship39。s Level 6, Fonseca tells us we39。re looking at rocks that are 2 billion years old. Some of the harsh striations have been dated to the tectonic plate shifts of 65 million years ago that broke up the Earth39。s landmass into the continents we know today. There are about 50 passengers on board, most huddled among the rails at 8 am in the bright red parkas provided by the Silversea cruise line. The air temperature is 9 C－ the water temperature is12 C, expedition leader Stefan Kredel announces on a loudspeaker, just in case anybody is planning to strip off for a morning swim. Our luxury vessel is small as cruise ships go. American TV39。s Love Boat may have had athousand cabins, sports courts and a pooland there are massive ships like that in the nextharbor with a big herd of passengers but things are more intimate Explorer39。s relative pettiness is key to our itinerary. At the moment, we are cruising overa channel 240 meters deep, but yesterday, winding through Skoldungen Fjord, we hadscooted over depths as shallow as 69 meters. You can39。t do that on the QEII. That flexibility is essential to the expedition ships and cruises offered by Silversea. Whilethe line offers the more traditional cruises focused on shipboard entertainment and portcalls for shopping and nightlife, the expedition variety is targeted at more adventuroussouls.We started these as outings to more outofthe way places, specifically the Arctic and theAntarctic, for active travelers who wanted to learn about and explore wilder places upclose,says parking your butt in a deck chair is your idea of a deluxe cruise, you39。re on