研究人员们最近估计，到本世纪中叶，哺乳类动物的物种数量将从目前的5500种上升至7500种。

Researchers recently estimated that the total mammal species count will rise from about 5,500 now to 7,500 by mid-century.

youdao

研究人员们最近估计，到本世纪中叶，哺乳类动物的物种数量将从目前的5500种上升至7500种。

Researchers recently estimated that the total mammal species count will rise from about 5, 500 now to 7, 500 by mid-century.

youdao

好莱坞迅速应对变化的能力使电影业继续保持稳定，目前大制片厂数量与二十世纪初持平。

Hollywood's ability to respond quickly to change has helped the film business to remain stable, with the same number of big studios now as in the early 20th century.

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