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Where Does Bad-breath Odor Come From? We all have offensive breath at one time or another. In most cases, offensive breath originates from bacteria in the mouth, although there are other more surprising causes. Until a few years ago, the most doctors
This is Scientific American's 60-Second Science. I'm Steve Mirsky . Got a minute ? Male chimpanzees often compete aggressively for mates. Now researchers have observed a friendlier behavior that males use to woo potential partners: they exchange meat
do v.aux.助动词(无词意) What do you call this in English? 这个用英语怎么说? do with 涉及到 What are you going to do with the books? 你打算拿这些书怎么办? do up one's hair
陈豪在北京的ABC美国公司工作。他遇到美国同事Amy。 (Office ambience) A:Hi Chen Hao, how are you today? C:还不错,你呢? A:I'm fine, just taking a quick break. C:我刚才看到一件怪事。 A:What? C:我在走廊
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