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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Alec believes showing interest is the key to winning a girl's heart.

要赢得女孩子的芳心，关键是要表现出感兴趣。

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The study subjects also saw their cholesterol levels - another key heart risk indicator - more than halved on average.

BBC: Smoking: The sex divide

Settling this debate once and for all will require large human trials to prove that lowering inflammation with a drug will reduce the frequency of heart attacks beyond what can be accomplished with existing classes of drugs (see: " Inflammation Is Key In Heart Attacks").

FORBES

Delta has remained mostly mysterious, but seems to play a key role in heart disease.

FORBES: Of Marathon Mice And Fat Men