The technique has already been proved. Many users have proved …

实践证明，该方式具有较大的使用价值。

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The selected series of standard of the footmark measurement has already been proved.

这项研究所精选的足迹测量的系列标准已得到证实。

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The technique has already been proved. Many users have proved that the mode has a high…

实践证明，该方式具有较大的使用价值。

youdao

It has already been proved that deaf birds, who cannot hear their own voices, soon develop a distorted song.

BBC: NEWS | Science/Nature | Sleep helps birds sing better