So if we do this and we form the molecule ammonia, let's switch to a clicker question, and have you tell me what the bond angle - is going to be in ammonia -- HNH Actually, let me draw it on the board as you look -- actually, can you put the class notes on, since you don't actually have your notes to refer to.

如果这样做的话，我们就可以形成氨分子，让我们来做一个课堂练习,你们告诉我氨分子中的键角是多少-,键角，the，h，n，h，bond，angle。,实际上让我在黑板上画出它来，这样你们可以看到实际上-,你能把课堂讲义放出来吗，因为你们没有讲义可以参考。

麻省理工公开课 - 化学原理课程节选

His new story helped: Fierstein has teased out the friendship between the straight factory owner and the factory-saving transvestite who suggests the boot switch, who bond over their harsh fathers.

WSJ: Cyndi Lauper just wants to have fun on Broadway

Surveys in America show that, on average, younger members of a 401(k) plan tend to keep a large chunk of their plan assets in equity funds, which are riskiest but also promise the highest returns over the long run, and that members switch into less risky bond and money-market funds as they get older.

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Should European interest rates start to rise, investors may switch back to less risky government bond markets particularly as higher interest rates tend to put heavily indebted junk-bond issuers under stress.

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