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- Quartz is common on Earth but exceedingly rare on Mars, indicating that granite, from which it forms, is scarce. 石英在地球上很常見(jiàn)，在火星上卻很少，這表示由石英構成的花崗巖非常稀有。
- One of the mission's main aims was to look for Helium 3, an isotope which is very rare on earth but could be an energy source in the future in nuclear fusion. 飛船的主要目的之一就是尋找氦-3，一種氦的同位素，它在地球上非常少見(jiàn)，但卻可能是將來(lái)核融合的能源來(lái)源。
- How on earth do they manage to rob the bank? 他們到底怎么搶了銀行的？
- Who on earth is that female he's with? 跟他在一起的那個(gè)女人究竟是誰(shuí)?
- Antarctica is the loneliest place on earth. 南極是地球上最偏遠的地區。
- No power on earth could force me to do it. 誰(shuí)也不能強迫我做這事。
- How on earth did you manage that? 你到底是怎么做的？
- I must be the happiest woman on earth! 我一定是世界上最幸福的女人了。
- The place becomes a hell on earth. 那兒成了人間地獄。
- Why on earth didn't you tell me the truth? 你到底為什么不跟我說(shuō)實(shí)話(huà)？
- Where on earth have we fetched up now? 我們現在究竟到哪里了?
- What on earth are you gabbling about? 你到底在咕嚕些什么?
- They are the best folks on earth. 他們是世上最好的人。
- The moon's pull affects the tides on earth. 月亮的引力影響地球上的潮汐。
- If there's a heaven on earth, this is it! 人間若有天堂，非此莫屬！
- What on earth will he get up to next? 下一步他究竟要耍什麼花樣?
- He saw the film several times; I wonder what on earth he saw in it. 他這場(chǎng)電影看了好幾遍了，我不知道他究竟喜歡這個(gè)電影的什么。
- Where on earth did you spring from? 你是打哪兒冒出來(lái)的?
- He looks like nothing on earth in those weird clothes. 他穿著(zhù)奇裝異服難看極了。
- I wouldn't marry you if you were the last person on earth. 即使世上就剩下你一個(gè)人，我也不會(huì )和你結婚。
