keep a jealous eye on

例句：

1. 1. She kept a jealous eye on her boyfriend's new girlfriend.
   她嫉妒地看着她的男朋友的新女友。
2. 2. The jealousy between the two brothers was palpable.
   两个兄弟之间的嫉妒感是显而易见的。
3. 3. He kept a jealous eye on his competitors, always trying to outdo them.
   他嫉妒地注视着他的竞争对手，总是试图超越他们。