ONE PHRASE, IN CONTEXT
暗中监视；偷偷观察
GET TO KNOW THE MEANING
IN A SENTENCE
The twins tried to spy on their older brother, but the squeaky floor gave them away.双胞胎想偷偷观察哥哥，却被吱呀作响的地板暴露了。
The twins tried to spy on their older brother, but the squeaky floor gave them away.
双胞胎想偷偷观察哥哥，却被吱呀作响的地板暴露了。
