So in terms of nitrogen that starts off with a valence number of 5, again we have 2 lone pair electrons in the nitrogen, and again, we have 6 electrons that are shared.

对于氮来说,我们应该从五个价电子开始，同样，氮也有两个孤对电子，共用电子的个数也一样，是六个。

麻省理工公开课 - 化学原理课程节选

So we would pair off students with Hispanic families in need,

我们会将他们与有需要帮助的拉美裔家庭结对，

帮助多文化的家庭 - SpeakingMax英语口语达人

They may even split the legal profession in two: big corporate clients will pair off with the big-five firms, leaving independent law firms with private clients only.

ECONOMIST: Strength in numbers | The

Qwest CEO Richard Notebaert has fought stubbornly to stay in the merger picture, despite MCI CEO Michael Capellas ' clear preference to pair off with the more financially stable Verizon.

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And he's off the pair with the most laconic flick off his pads you could ever wish to see for two.

BBC: India v Australia day five as it happened