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【正文】 Aomori Hakodate Tunnel in Japan was a domestic one. It was built to connect the cities of Hokkaido and Honshu. Instead of a mountain, this tunnel was built beneath water area, which is km in width and 132 metres in depth. Moreover, the construction is a bination of three straight tubes with a total length of km to fit the shape of the water Reaching the depth of 240 metres from the water surface, the bottom of the tunnel is even deeper than the water to avoid the very hard stone layer 0f quartzite around. This construction takes workers nearly 25 years to plete it.八 The picture below shows how a hot balloon works. Summarize the information by selecting and reporting the main features. The picture illustrates the working principle of a hot balloon. A hot balloon is mainly posed of a large envelope, a basket and burners. The envelope is actually a fabric balloon filled with air. It39。s made of gores and panels as its body, with a parachute valve on its top and a skirt at its bottom. The basket, where the passengers and pilots stand and the propane cylinder is set, is connected to the envelope by several ropes. The hot balloon is able to rise into the air based on a simple principle that the warm air in the balloon is lighter than the cooler air around it so that the hot balloon flies. To keep the balloon in flight, the air in the balloon must be continually heated with the burners. And the burners just mix propane with air to produce flame to fill hot air into the envelope. Besides, the parachute valve is actually a selfsealing flap that allows hot air to escape at a controlled rate in order to ascend or descend the balloon, or deflate the balloon to land.九
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