音标：[tri'pæniŋ] ；

开[套]孔, 打眼, 穿孔(试验)

v cut a hole with a trepan, as in surgery

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发表于:2019-02-07 / 阅读(63) / 评论(0)

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发表于:2019-02-18 / 阅读(92) / 评论(0)

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The navy has prepared for this by building what is called a weak link into their anchor chains. The weak link is the last link in the chain, and while its strong enough to hold together in general, its weak enough to break if the whole weight of the

发表于:2019-02-23 / 阅读(68) / 评论(0)

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Weve recently been talking about the Fermi Paradox, attributed to Nobel-winning physicist Enrico Fermi. According to reasonable estimates of how many stars have planets, how many planets may be suitable for the evolution of organisms, and so on, our

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The Oort cloud is a spherical haze of comets that surrounds our entire solar system. We often get the false impression that the solar system ends with Pluto. In fact, beyond Pluto is the Oort cloud, encircling everything else like an enormous shell.

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If youve ever driven in LA, you know that people dont cooperate terribly well. Traffic jams, folks cutting folks off, people shouting at you out their windows . . . its a real headache. Wed all do a lot betterat least, wed all move through congestion

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analysis of satellite resonance

antistreptolysin O test