Question

翻译（急！急！！！！！！！！！）

Many people have wondered what makes the oceans rise and fall on the world's beaches twice a day. Those tides are caused by the force of the Moon's graveity(地心引力) and the rotation(自转) of the Earth.
Gravity acts on the center of any solid object. The Earth is mostly molten(熔化的) rock, but compared to the oceans, we can think of it as a solid object.
As you know, the oceans are fluid and lie on the surface of the Earth. When the Moon is overhead, the oceans are four thousand miles closer to the Moon than the Earth's center is. Because the oceans are closer, the Moon pulls harder on the water than on the Earth. This stronger pull makes the water bunch up a little under the Moon, creating a high tide.
At the same time, the oceans on the opposite side of the Earth are four thousand miles farther from the Moon than the Earth's center is. The Moon's pull on this water is weak. This water bunches up because it is "left behind"(making another high tide) as the Earth is pulled slightly toward the Moon.
When the waters bunch up on these two sides of the Earth, they draw water away from the other side of the Earth, which creates the low tices.
As the Earth rotates, different parts of the land and oceans pass through the high-tide and low-tide zones. And that makes the waters on our coasts go up and down.

Answer 1

潮起潮落,在世界各地的海滩上,人们每天两次看到海洋的这种现象,很多人惊奇不已。事实上，潮汐的产生是由于地心引力和地球自转的作用。
重力作用于固体的重心。虽然陆地的构造主要是熔岩，但和海洋相比较而言，我们基本上可以把它视作固体。
众所周知，海洋是位于地层表面的流体。月正当空时，海洋与之的距离比起地层重心与之的距离要近四千英里。因此，月亮对海水的引力大于对地层的引力。这种较强的引力使得海水在月亮下略微扩张，从而出现海潮。
同时，地球另一面的海洋则比当地的地层重心距离月亮要远上四千英里。月亮作用于海水的引力相对微弱。因此当地层被引力作用略微倾向月亮时，海水被留在后面，产生另一种海潮。
当海水在地球两面涨潮时，会汲取周围区域的海水，从而带来这些地方的落潮。
同时由于地球不停的自转，陆地和海洋的不同区域也就会依次进入涨潮区和落潮区。是这些原因，使得海平面生生不息地潮起潮落。

Answer 2