On Monday,Washington,D.C., health officials reported shocking information about H.I.V.
VOA : special.2009.03.20
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And one thing I want to tell you to start out with is something about this c h 3 group here.
有一点需要告诉大家的是,从这个一个碳原子和三个氢原子的组合开始。
化学原理课程节选 : 麻省理工公开课
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And we give different names, depending on what kind of electrons we're dealing with, so, for example, with h c l here, we can talk about having bonded versus lone pair electrons.