According to Chinese traditional medicine, start of summer is a key time to moisten the heart.

中医认为，立夏是滋润心脏的关键时刻。

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At the heart of the debate over illegal immigration lies one key question: are immigrants good or bad for the economy?

关于非法移民的争论的核心是一个关键问题：移民对经济是好还是坏？

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Remember that she will set certain traps to test whether you're out for her money, and the key to winning the heart of she-millionaire is to pass muster.

记住，她会给你设些陷阱考察你是否是冲着她的钱去的。要赢得富婆心关键就是要通过这个测试。

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They may inflict "mass casualties" and constitute a "severe" threat to the Government Security Zone (including the Houses of Parliament and key executive offices) in the heart of London.

CENTERFORSECURITYPOLICY: Yes, they can

DeCode researchers spent four years analyzing the DNA of the Arnasons and thousands of other Icelandic heart patients, unearthing a couple of key suspects:two gene variants, previously thought to be involved in asthma, that nearly double the risk of heart attack by boosting levels of a molecule that promotes inflammation of the artery walls.

FORBES: Attacking Heart Attacks

For two decades, Mr Donaldson, was a key informer at the heart of Sinn Fein's political machinery.

BBC: Profile: Who was Denis Donaldson?