spy upon

• 窥探

spy upon的用法和样例：

例句

1. He often went to spy on her, but he never dared to let her see him.
   他经常窥探她的行动，但从未敢让她发现自己。
2. One morning, this spy saw Jean Valjean, with an air which struck the old gossip as peculiar, entering one of the uninhabited compartments of the hovel.
   有一天早晨，这个蓄意窥探的老婆子看见冉阿让走进这座破屋的一间没有人住的房里去了，觉得他的神气有些特别。