1.表述：the apple of one’s eyes
释义：A cherished or favored person. （掌上明珠，最爱好的人，最珍爱的人）
例句：He has five kids, but his only daughter is clearly the apple of his eye.
He told her that she was the apple of his eye, that she was wound around his heartstrings.
The black currant trees were the apple of Joseph's eye.
John regarded the gold ring left by his dead wife as the apple of his eye.
2.表述：apple of discord
释义：Something that causes unhappiness or trouble.（祸胎）
例句：That prom dress has been their apple of discord—they've been fighting over who gets to wear it for days now!
Why aren't you talking to Mary Beth? What is the apple of discord here?
The right to inherit the large estate became the apple of discord among the three brothers.
The use of the car was an apple of discord between Jack and his wife.