1. Early next morning, she heard planes passing overhead and wondered how she could send a signal.
    第二天清晨，她听到头上有飞机飞过，却不知道怎样才能发出信号，

2. Early next morning, she heard planes passing overhead and wondered how she could send a signal.
    第二天一大早，她听到头顶上有飞机飞过，但不知道怎样才能发个信号。

3. By the time we reach the Rockies, my parents try to make me look at the spectacular landscapes we're passing by.
    当我们驶近落基山脉时，我父母想叫我看看我们外面的壮丽景色。

4. But these terms have always been just words, affecting someone else's world, like a passing ambulance.
    但是这些字眼一直只不过是些字眼而已，就像一辆驶过的救护车，影响的只是别人的世界,

5. But they reasoned that it would be worth it if their children got into private schools early and did not have to worry about passing examinations later on.
    可她们又辩解道，如果自己的孩子能早日进入私立学校，用不着以后担心通过入学考试，那么这么做也是值得的。"

6. Water is purified by passing through rock.
    水在穿透岩石的过程中获得了净化.

7. When a passing tanker rescued them five days later, both men were genuinely sorry that they had to leave.
    5天后，一条油轮从那儿路过，搭救了他们。这二位不得不离开那个荒岛时，还真的感到遗憾呢！

8. What causes the acid rain that forms from water passing through polluted air?
    是什么造成了雨水穿过污染的大气而形成的酸雨？

9. This decline in vigour with the passing of time is called ageing.
    这种随着时间流逝的活力衰退就叫做衰老。

10. This decline in vigour with the passing of time is called ageing.
    这种随着时间流逝的活力衰退就叫做衰老。