But students still have various kinds of problems when they encounter native speakers of English.

但是，在与以英语为本族语的人交际中，学生们仍存在着各种问题。

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I think that this theme can reflect various kinds of problems confronted by China's contemporary art.

笔者认为，这一主题反映了中国当代艺术对可能面临的诸多问题的思考。

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So she created teams of two to five people, drawn from 700 volunteers, and asked the teams to solve various kinds of problems.

所以她从700名志愿者中挑选，建立了几个由2 - 5人组成的团队，然后让这些团队去解决不同种类的问题。

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Grundy, a the University of Texas Southwestern cardiologist who co-wrote the U.S. cholesterol guidelines, has argued that increasingly, clinical trials must use endpoints that lump together various kinds of heart problems if they have a hope of proving the benefits of drugs.

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Collection by various kinds of cameras and electronic intercepts suffers from problems not entirely dissimilar.

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