For Valentine's Day, NBC Learn takes a look at the chemistry of chocolate, explaining why the treat is so irresistible thanks in part to its ideal melting temperature and mood-lifting compounds.

对于情人节，NBC learn 关注了巧克力中的化学，解释了我们对其如此难以抗拒的原因部分是因为它理想的熔化温度和情绪提升的化合物。

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Sometimes, you are in the mood for a relaxed drink in a softly-lit lounge and other times, for a face-melting guitar solo by one of China's up and coming rock bands.

有时候，你可能想在一个带有柔光的酒吧里享受一杯饮料，可是有时候你可能想被一个即将成名中国乐队的吉它独奏给震撼。

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