Mount Etna is one of the most active volcanoes on Earth.(埃特納火山是地球上最活躍的火山之一。)

We have fossil fuel on Earth.(我們地球上有化石燃料。)

A Christmas wreath exclaiming PEACE ON EARTH hangs on the restaurant door.(一個寫著“世界和平”的圣誕花環懸掛在飯店的門上。)

What on earth are you doing?(你究竟在干什么？)

It often stops the view of telescopes on Earth.(它經常使地球上的望遠鏡無法看到。)

How on earth can she afford that?(她怎么可能負擔得起呢？)

Such impacts continue to pose a natural hazard to life on Earth.(這些撞擊會持續對地球上的生命構成自然威脅。)

Altogether there are some ten thousand of these volcanoes on Earth.(地球上總共有大約一萬座這樣的火山。)

One out of nine people on Earth does not get enough food.(地球上每九個人中就有一個人得不到足夠的食物。)

Actually space technology helps people on Earth every day.(實際上，太空技術每天都在幫助著地球上的人們。)