We also need to know the methods used to restore metal to its original condition.

同时，怎样将金属回复到其原来的状态，也是我们要研究的内容。

youdao

Methods The method we used here was administering the drug directly.

方法采用直接给药的试验方法。

youdao

Methods The method we used here was administering the drug directly.

方法采用直接给药的试验方法。

youdao