单词:p-aminoacetanilide
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This is Scientific American's 60-Second Science. I'm Karen Hopkin. This will just take a minute. As Valentines day approaches, remember, its the thought that counts. Just ask a decorated cricket. Because according to a study published in the January
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1) head to head / toe to toe 直面对战 2) face to face 面对面 3) see eye to eye 意见相同