1·I wonder if I shall fall right through the earth!
我想知道我会不会正好穿过地球掉下去！
2·If the Sun was at the center of the universe, things would fall toward the Sun and away from the Earth, which of course they didn't.
如果太阳在宇宙的中心，物体就会离开地球向太阳落去，但事实显然没有。
3·Why things don't fall off the earth is explained in the text.
为什么东西不掉离地球课文里已有说明。
4·This makes the satellite fall down to the earth.
这使得卫星坠落到地球上。
5·Computer simulations of this impact show that both of the objects would melt in the impact and the dense core of the impactor would fall as molten rock into the liquefied iron core of Earth.
对这次撞击的计算机模拟显示，这两个物体都会在撞击中熔化，而撞击者稠密的核心会以熔融岩石的形式落入地球的液化铁芯中。
6·Afraid that in her unclear state of mind she might fall off the rock to her death, Grant climbed on all fours up a tight, narrow path by digging into the earth with his fingers and feet until he reached Paula.
担心她在神志不清的状态下会从岩石上掉下来摔死，格兰特手脚插入泥土，四肢并用地沿着一条狭窄的小路往上爬，一直爬到宝拉身边。
7·Why do stones fall because they do strive to reach the center of the earth.
为什么石块会下落呢，仅仅是因为要到达地球的中心。
8·That sort of thing comes easy to any folk not brought firmly back to earth once a year by a fall.
而这样做对于不能一年一度被秋天坚实地带回到人世中来的人并不困难。
9·Well, the earth is going to fall towards the apple — So the force on the earth is the mass of the earth times the acceleration of the earth.
地球也会坠向苹果-，因此地球上的力与地球的质量相等，再乘以地球的加速度。
10·Sometimes the moon doesn’t completely fall into the shadow of the Earth, however.
有时候，月亮并没有完全进入地球的影子，这时候，只有一部分月亮变暗，我们将看到偏食。