地球

yǐ qián rén men xiāng xìn dì qiú shì píng de

以前人们相信地球是平的。

It used to be believed that the earth was flat.

dì qiú shì wǒ men gòng tóng de jiā yuán wǒ men yī dìng yào bǎo hù dì qiú

地球是我们共同的家园，我们一定要保护地球。

The earth is our common home, so we must protect it.

dì qiú zì zhuàn xiǎo shí qī jiān wǒ men jiù huì jīng lì liǎng cì de zhǎng cháo

地球自转24小时期间，我们就会经历两次的涨潮。

We pass both high tides during each twenty-four-hour rotation of the earth on its axis.

dì qiú de biǎo miàn

地球的表面

the earth's surface

dì qiú de zì zhuàn

地球的自转

the revolve of earth