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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"I think that kids learn best by doing," Morgan says, explaining why she believes the challenge is so valuable.

“我认为孩子们通过动手学得最好，”摩根说，她解释为什么她认为这个挑战如此有价值。

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Of this book to learn C++ based on their personal experience and years of teaching experience, using simple examples and concise narrative explaining C++ programming, unique.

本书作者根据自己学习C++的亲身体会及多年教学经验，用简单的例子和简练的叙述讲解C++编程，别具特色。

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Explaining that the country must learn to build from the grassroots, they use the current buzzwords of western policymakers such as transparency, accountability and empowerment.

ECONOMIST: Neither Hutu nor Tutsi, just Rwandan

"We had to learn to work with earth, " says Vaitsos, explaining the man-made crater that Tsakonas's house is named after, and the steep slopes many of the houses are built on or literally into.

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