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As mines age, ore grades decline, since the best stuff is usually dug up first. 随着矿山年龄的增长，铁矿石的等级下滑，因为最好的往往被最先发掘。 - 2
PERTH, Australia, Dec. 20 (UPI) — Breastfeeding for six months or longer is linked to better grades at age 10, but only in boys, Australian researchers say. 12月20日澳大利亚珀斯(合众国际社报道)——母乳喂养6个月或者更长的孩子在10岁的时候学习成绩会更好些，但是这仅仅局限于男孩子，澳大利亚研究人员表示。 - 3
But Michel grades are very good, a way of skipping, at the age of 24 has been Harvard PhD law! 但米歇尔学习成绩非常好，一路跳级，24岁就已是哈佛的法学女博士！
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