然而要小心，许多用例的初学者走过了头，建立了太多的低层用例。

However, be aware that many use-case beginners go overboard and create too many low-level use cases.

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国内外学者用多元回归的方法提出了许多的图表和公式。

Many scholars have advanced lots of charts and formulas in virtue of regression methods.

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许多学者的研究表明：在面对面交际中有70%的信息是通过非言语手段进行的，用言语方式表达的只有30%。

The scholars studying communication state that in face - to - face communication over 70% of all information is sent by nonverbal means while 30% is conveyed through speaking.

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