discord的意思是“不和；不调和”，apple of discord的真正意思是指“不和的根源，争斗的原因或根源”。

【例句】
The property he left was the apple of discord among his three daughters.

他的遗产是三个女儿不和的根源。

Everyone said I was an apple of discord.

他们都说我是个祸根。