But she added that "a period of careful consideration" is necessary in order to determine the best way forward in dealing with North Korea, perhaps a sign that China is not yet ready to support U.N.Security Council action.

VOA: standard.2010.05.25

So, let's try another example here, and let's try a case now where instead of dealing with a neutral molecule we have an ion, so we have c n minus.

那么，让我们来试一下另外一个例子，这次不是一个中性原子,而是一个离子，氰离子。

麻省理工公开课 - 化学原理课程节选