如果你仔细观察，你会发现这是三种不同形式的碳的混合物。

If you look more carefully, you will find that this is a blend of three different forms of carbon.

youdao

如果你仔细观察，你会发现这是三种不同形式的碳的混合物。

If you look more carefully, you will find that this is a blend of three different forms of carbon.

youdao