地球

月球是地球唯一的卫星。

月球是地球唯一的衛星。

The moon is the earth's only satellite.

现代交通使我们能在几天内环绕地球。

現代交通使我們能在幾天內環繞地球。

Modern travel enables us to go around the world in a few days.

地球的表面約有三分之一是陸地。

About one third of the earth's surface is land.

地球上有很多國家和文化。

There are many countries and many cultures on Earth.

地球比太阳小。

地球比太陽小。

The earth is smaller than the sun.