Now, a more expressive, yet less common, phrase is apple of discord.

现在，" apple of discord" 是一个更富于表现力却没那么常见的短语。

You have introduced a topic on which our natures are at variance—a topic we should never discuss: the very name of love is an apple of discord between us.

你介绍了一个我们本性不一致的话题——一个我们永远不应该讨论的话题：爱的名字本身就是我们之间不和的焦点。