the apple of someone's eye
US /ðə ˈæpəl əv ˈsʌm.wʌnz aɪ/
UK /ðə ˈæpəl əv ˈsʌm.wʌnz aɪ/

1.
掌上明珠, 心肝宝贝
a person or thing that someone loves most and is very proud of
:
•
His youngest daughter is the apple of his eye.
他最小的女儿是他的掌上明珠。
•
That old car is the apple of his eye; he spends hours polishing it.
那辆旧车是他的掌上明珠;他花好几个小时擦亮它。