We know an earthquake toppled Troy.

我们知道地震摧毁了特洛伊。

What is difficult to do before an earthquake?

在地震前什么是难以做到的？

It is also said that mice and snakes head for safer ground several days before an earthquake.

据说老鼠和蛇在地震前几天会前往更安全的地方。

Scientists think that the city was sent to the bottom of the sea after an earthquake and tsunami more than a thousand years ago.

科学家认为这座城市是在一千多年前的地震和海啸后沉入海底的。

This area is in danger of having an earthquake.

这个地区有危险发生地震。

They conduct an earthquake manoeuvre once a month.

他们每个月都会进行一次地震演习。

They are discussing how to deal with an earthquake.

他们正在讨论如何应对地震。

We need to prepare emergency supplies for an earthquake.

我们需要准备好应对地震的应急物资。

The sniffer dog helps find survivors after an earthquake.

搜救犬在地震后帮助寻找幸存者。

The strange behavior of the animals portends an earthquake.

动物的异常行为预示着地震。