单词:TIP (tangential in-phase)
叶片)切向同相位(振动)
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Five Did you tip the bellboy? 你付小费给那个服务生了吗? 1 Introduction A It is the custom to give tips to waiters in restaurants and taxi drivers. 在餐馆给服务员小费、给的士司机小费被认为是习俗。 B It is also American custom when visiting friends t
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This is Scientific Americans 60-Second Science, Im Cynthia Graber. This will just take a minute. Not too long ago, scientists had to hoof it to the library to review the literature. And they had to flip through a card catalog to find that dusty old v
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I once read an essay by Joseph Epstein in which he describes the glee and suspense in watching a stranger read his essay. Its happened to many novelists too the coincidental (dreamed-about) situation where you encounter a stranger reading pag
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