Because the earth's oceans are so vast, much of the seafloor is unexplored.
地球上的海洋面积相当广大, 大部分的海底陆地皆尚未被人探测过.
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Their current supplier only gives twenty days, so our usual twenty-nine is already much better.
他们现在的供应商只给了20天,所以我们平时给的29天已经好多了。
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The last lesson moves me so much that I've made up my mind to add more knowledge and bonuses.
上次课太让我感动了,于是我决定多加讲课内容和额外奖励。
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