Love is the key that opens the door of happiness.

爱是开启幸福大门的钥匙。

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Compassionate love is the key element in a happy marriage.

爱是幸福婚姻的关键元素。

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Love is the key to happiness and it is a real blessing to others.

爱是幸福生活的钥匙，爱是对他人真挚的祝福。

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So the key is to find what you love to do, do it, but don't overdo it.

所以重要的是找你喜欢做的，好好做，但不要过度。

健康生活 - SpeakingMax英语口语达人

He played guitar on Rolling Back The Rivers and harmonica on Love Is The Key.

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But probably the key is Mr Stella's love of work.

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