on the earth的用法和樣例：
例句
- If it were not for oxygen and nitrogen in the air, no man could live on the earth.
大氣中如果沒有氧和氮，人就無法生存於地球了。 - There are millions of living things on the earth.
世界上有數以百萬計的生物。 - Long ago enormous animals lived on the earth.
很久以前，地球上生活著巨大的動物。 - Scientists have set up two kinds of relay stations. One kind is on the earth, the other is a satellite placed in space around the earth.
科學家們已建立了兩種中繼站，一種在地球上，而另一種是放在地球周圍太空中的衛星上。
