单词：covalent interaction
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Everyone has periods in their lives when everything seems very hard, when there's nobody to talk to and the mood is just getting worse and worse. But why sit and think how pathetic you are? There are some things that may help you lift up your mood. I
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How You Can Broaden Your Horizons with Travel Instead of just sitting on some tropical beach and sipping pina coladas during your vacations, it is very possible to get a ton of personal growth from your travels. But in order to do this, you will have
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Tips for Happy Life幸福的要诀We've always been told it's true, but now experts have proved that money really can't buy you happiness. 尽管我们总听到这样的话：金钱并不能买到真正的幸福。不过这次专家们印证了这一点
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