In addition to his movie work, Redford is known as a champion of environmental causes.
除了电影事业外，雷福德还是知名的环保斗士。
That environmental change itself has two causes.
环境的变化自身有两个原因。
We hope the research community can determine if the causes are environmental.
我们希望研究界能够确定是否是环境引起。
We hope the research community can determine if the causes are environmental.
我们希望研究界能够确定是否是环境引起。
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