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1.at the heart of 位于…的中心
But we are suffering from a moral crisis, too, one that may lie at the heart of our problems.
但是我们也在经历一个道德危机，而它可能就隐藏在我们问题的核心当中。
2.take over 接管；统治
And above all, they must train and expand the Afghan army and police so they can gradually take over.
最重要的是，他们必须培养和扩大阿富汗军队和警察，以便他们最终能自己接管。
3.hold the answer 给出答案
The emotional words contained in hundreds of millions of messages posted to the Twitter website may hold the answer.
通过推特网站发布的数以亿计的情绪词汇可能持有答案。
