Walter Schmidt has been working to find USES for chicken feathers since the nineteen nineties.

自二十世纪九十年代以来，Walter Schmidt就一直致力于研究鸡毛的用途。

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Walter Schmidt has been working to find USES for chicken feathers since the nineteen nineties.

自二十世纪九十年代以来，Walter Schmidt就一直致力于研究鸡毛的用途。

youdao