1. This increases their air-resistance and reduces the shock of impact when they hit the ground.
    这样就加大了空气阻力，并减少了它们着地时冲击力带来的震动。

2. This would solve the problem of ventilation, for if a train entered this tunnel, it would draw in fresh air behind it.
    这样就解决了通风问题。因为如果有列火车开进隧道，它就把新鲜空气随之抽进了隧道。

3. The air was so warm and bright, and I could hear the blackbirds whistling on the edge of the woods, and the Prussians drilling in the meadows behind the sawmill.
    天气多么暖和，多么晴朗呀！林边树梢上画眉在吟唱，锯木厂后面的草坪上传来普鲁士军人操练的声音。

4. This air we call the atmosphere.
    我们称之为大气层。

5. The air is always moving.
    空气无时不在流动。

6. The movements of air make winds.
    空气流动便形成了风。

7. Tiny drops of water in the air form clouds.
    空气里的小水珠形成了云。

8. The "bad air" over the marshes was believed to be its cause, and this belief gives the disease its modern name, for the Italian words for "bad" and "air" are mala and aria.
    沼泽地带上面的“坏空气”被认为是导致疟疾发生的原因，这种观点赋予了这种疾病现在这个名字，因为“坏”和“空气”的意大利语分别是mala和aria。

9. This in turn pushes up the program cost, estimated at about $3,800, including air fare.
    这样就增加了留学的费用，加上飞机票，估计费用大约为3,800 美元。

10. They had the English Channel as a barrier against the Nazi ground forces, and they had the Royal Air Force(RAF) to battle the Nazis in the sky.
    他们有着英吉利海峡这道抵挡纳粹地面部队的天然屏障，还有皇家空军在空中与纳粹作战。