There are only a limited number of tests that scientists can run on the rocks, and their results remain murky.

科学家们也只就有限数量的的岩石进行过测试，并且结果仍然是不明朗的。

youdao

There are only a limited number of tests that scientists can run on the rocks, and their results remain murky.

科学家们也只就有限数量的的岩石进行过测试，并且结果仍然是不明朗的。

youdao