内蒙古乌拉特中旗新太古代变质侵入岩的地球化学特征及构造意义

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Laugh and cry. Having a good sob is reputed to be good for you. So is laughter, which has been shown to help heal bodies, as well as broken hearts. Studies in Japan indicate that laughter boosts the immune system and helps the body shake off allergic reactions.
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