Flatworms such as these are just one of the 33,000 known species in Japanese waters.

像这样的扁虫只是日本水域中33000已知的物种之一。

youdao

Flatworms such as these are just one of the 33,000 known species in Japanese waters.

像这样的扁虫只是日本水域中33000已知的物种之一。

youdao