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- Quartz is common on Earth but exceedingly rare on Mars, indicating that granite, from which it forms, is scarce. 石英在地球上很常见,在火星上却很少,这表示由石英构成的花岗岩非常稀有。
- 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. 飞船的主要目的之一就是寻找氦-3,一种氦的同位素,它在地球上非常少见,但却可能是将来核融合的能源来源。
- How on earth do they manage to rob the bank? 他们到底怎么抢了银行的?
- Who on earth is that female he's with? 跟他在一起的那个女人究竟是谁?
- Antarctica is the loneliest place on earth. 南极是地球上最偏远的地区。
- No power on earth could force me to do it. 谁也不能强迫我做这事。
- 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. 那儿成了人间地狱。
- Why on earth didn't you tell me the truth? 你到底为什么不跟我说实话?
- Where on earth have we fetched up now? 我们现在究竟到哪里了?
- What on earth are you gabbling about? 你到底在咕噜些什么?
- They are the best folks on earth. 他们是世上最好的人。
- The moon's pull affects the tides on earth. 月亮的引力影响地球上的潮汐。
- If there's a heaven on earth, this is it! 人间若有天堂,非此莫属!
- What on earth will he get up to next? 下一步他究竟要耍什麽花样?
- He saw the film several times; I wonder what on earth he saw in it. 他这场电影看了好几遍了,我不知道他究竟喜欢这个电影的什么。
- Where on earth did you spring from? 你是打哪儿冒出来的?
- He looks like nothing on earth in those weird clothes. 他穿著奇装异服难看极了。
- I wouldn't marry you if you were the last person on earth. 即使世上就剩下你一个人,我也不会和你结婚。