源自《圣经·旧约·诗篇》第17章，Keep me as the apple of eye. (求你保护我，如同保护眼中的瞳孔。)另《申命记》第32章也出现He kept him as the apple of his eye. (保护他如同保护眼中的瞳孔。) 现译：“掌上明珠”，表示特别珍视的东西。
例如：
His youngest son was the apple of his eye.
他的小儿子是他的心肝宝贝。
who's the apple of your eye ? Write down to get the scores.
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the apple of the/one's eye 眼睛中的瞳孔