【正文】 , with that knowledge, you will make the second observation of the same child to see if these expected developmental behaviors are exhibited. Student: Can you give me an example? Professor: Well, en, if you observed a 4 yearold child, for example, my daughter is 4 years old。s we39。t necessarily inc lude things like sculptures or decorative walkways or… or even eye catching window displays, you know art. Although I bet the first to admen those things are ascetically appealing, however, visually pleasing sights, while there are not a part of pedestrian malls design that matter than most. The key consideration is a pact and convenient layout. One which allows pedestrians to walk from one end of the mall to the other in just a few minutes, so you can get the major stores, restraints and other central places without having to take more than one or two turns. Now, this takes a careful uncreative planning. But now what if one ingredient to this planning recipe is missing? There could quite be possibly long lasting effects. And I think a good example is pedestrian mall in the Louisville Kentucky for instance. Now when the Louisville mall was built, it has lots of visual appeal, it was attractively designed, right in the small part of downtown and it pretty much possessed other design elements for success. But now, here is my point about location es into play. There wasn39。s like there is more standing water, more Stillwater around, and that water is a lot cleaner than swiftly flowing water, because the dirt and settlement and stuff has the chance to sink to the bottom. Professor: More important for our discussion, wetland areas support a lot more variety of life than swiftly flowing water. For example, there are more varieties of fish or insects, lots of frog spices, and then species that rely on those species start to live near the wetlands too. Student: Yes, like birds and mammals that eat the fish and insects, and you can get trees and plants that begin to grow near the standing water, that can39。t there? Student: You just have a regular running stream, because there is no dam, so the ecosystem would be pletely different, there would be fewer wetlands. Professor: Exactly, so, now let39。s the critical species that keeps the system going. Now, beaver populations are on the rise again, but there is something to think about. Consider humans as part of these ecosystems, you39。m taking the first year Spanish this semester. Our professor says that we need to e here to view a series of videos. I think it is called Spanish Working onYourAccident. Manager: Yes, we have that. Err...They are on the wall behind you. Student: So, I can just take....err.....Can I take the whole series home? I think there are three of them. Manager: I guess you haven39。t want to miss out everyone es in a once. Manager: Oh, no, we have several copies of each tape of Spanish accident series. We usually have multiple copies for everything for each video collection. Student: Super. So...how many rooms are there total in the lab? Manager: 20. They are pretty small. So, we normally get one person or no more than a small group of people in their watching the video together. Actually, someone else for your class just came in and took the first Spanish video into watch. You could probably run in a watch with them. Of course, you are wele to have own room. But, sometimes students like to watch with classmate, so they can review the material with each other afterwards. For example, it was with some content they didn39。 these were more like long stories. I mean one of them must all about love, but the other one the Chan…Chan…whatever it called, the other one。s especially interesting about meteoroids is that they e from interplaary space, but they consist of the same chemical elements that are in matter originated on earth, just in different proportions. But that makes it easier to identify something as a meteoroid, as it opposed to…to just a terrestrial rock. So to talk about where meteoroids e from, we need to talk about ets and asteroids, which basically...they’re basically made up of debris left over from the origin of the solar system billion years ago. Now I39。ll just cover some basic info about them. OK, ets and asteroids. It might help if you think of...remember we talked about the two classes of plas in our solar system? And how they differ in position? The terrestrial plaslike Mars and Earthposed largely of rocks and metals, and the large gas giants, like Jupiter. Well, the solar system also has two analogous classes of objects, smaller than plasnamely, asteroids and ets. Relatively near the sun and inner solar system, between Jupiter and Mars to be precise, we’ve got the asteroid belt, which contains about 90 percents of all asteroids orbiting the sun. These asteroids are…uh…like the terrestrial plas, and they39。re called meteors. Most of them are very small, and they burn up soon after entering earth’s atmosphere. The larger ones t