At present, a group of researchers in Asia is studying aerosol particles and their effects on the environment-and they have plenty of dust to work with.

现在亚洲有一批研究人员正在研究悬浮颗粒及其对环境的影响——他们要研究的沙尘可多着呢！

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Asking and answering questions is one of the most effective ways of learning, whether you're studying alone or with a group, and nothing beats full participation in class for quick learning.

不管你是一个人学习，还是与别人一起学习，问答都是学习的最有效的方法之一。在课堂上充分参与是快速学到东西的最佳方法。

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I had a conversation in the early 1980s with a group of graduate students from China who were living and studying on the U. S. East coast.

80年代初，我和一群在美国东部生活学习的中国研究生进行过一次对话。

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But those liabilities may not have remained with the communists: a group of Czech lawyers studying a 1968 treaty between Czechoslovakia and Italy suspects that, under it, life-assurance liabilities may have reverted to the Italians.

ECONOMIST: Insurance and the Holocaust