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假定你是李华,你的美国朋友Jack来信说,他暑假后将到北京大学留学。请你根据以下内容给他写一封回信,告知相关情况。

1.简单介绍北京大学;

2.简单介绍北京(例如生活便利,居民友善等);

3.留学期间愿意提供任何帮助。

注意:1.词数100左右:2.可以适当增加细节,以使行文连贯。

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Perfumers pay big money for ambergris because it is a fixative, which means it holds a smell in place on a person's body.

"Cheap perfumes smell good in the first hour or so and then everything is gone," explains Bohlmann. "But expensive perfumes are much more stable. Their smell lasts much longer, for hours or even a day after you apply them. "

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Bohlmann admits he never thought he'd get into the perfume business. But now, he says, producers have been calling to find out how to use his technology in new perfumes.

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