在气动技术中，很多学者对此进行了一定的研究。

Many scholars have studied on that in pneumatic technology.

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利用不变形式的方法对复流形上的CR—子流形进行了一定的研究。

In this paper we study CR - submanifolds of a complex manifold using the method of the invariant form.

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进而对利益相关方的角色风险管理进行了一定的研究，并总结了几点识别方法。

Turn on the role of stakeholders in risk management for a certain amount of study and summing up a number of identification methods.

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