It's in her system-- it's a bittering agent.

她身有 是种苦味剂。

What he and his colleague Kaylyn Kirkpatrick found was that hops - the bittering agent in beers - might be to blame.

他和同事凯琳·柯克帕特克发现，可能要归咎于啤酒中的苦味剂啤酒花。

Let's say my brother wanted to monopolize the pesto supply; he could sneak a bittering agent onto my slice of bread before I spread the pesto on it.

假设我哥哥想独享父亲的香蒜沙司，于是，在我吃饭前，他在我的面包上涂了一些有味的东西。