What is the active ingredient in aspirin?

什么是阿司匹林中的有效成分？

The active ingredient in some of the mouthwashes was simply detergent.

某些漱口剂中的活性成分只是清洁剂而已。

What is an active ingredient?

什么是活性成分？

The active ingredient in Coke is phosphoric acid.

可乐中的活跃成份就是含磷的酸性物质。

What's the active ingredient in your sunscreen?

什么是活性成分在您的防晒霜？