turn to(把注意力等)转向

例句：More and more people turn to computer science.
      愈来愈多的人从事计算机科学研究。

      We are all turning our thoughts to the matter.
      我们大家都开始转而考虑这个问题。

2.At a time when some doubt the benefits of cooperation between the United States and China, this visit is also a chance to demonstrate a simple truth.

when定语从句，修饰time

先行词是time时，若表示“次数”，应用that引导定语从句，that可省略；若time表示“一段时间”，则用when或at / during + which引导定语从句。如：
       This is the second time (that) the President has visited the country.
        This was at a time when / during which there were no radios, no telephones or TV sets.
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