spy on

基本解释

One-third of mendidn't bother to wash after using the bathroom, compared with 12percent of women, said the researchers who spy on people in publicrestrooms.
据专门监测使用公厕人群的调查人员介绍，三分之一的男性上厕所后不洗手，而女性的这一比例仅为12%。
edu.sina.com.cn
Some paranoid types will believe this is nothing more than "the man" trying to spy on us, but those people need to realize everything we do online is being watched by someone.
有些多疑的人认为这不过是个暗中监视我们的玩意，但他们应该了解，我们在网上的一举一动其实都在被人盯着。
He wore a baseball cap with a brim that poked out like an oversize duck's bill like the Cyrano of duck bills the crown of which read "They spy on you".
他戴着一顶棒球帽，突出的帽檐就像是一个特大号的鸭嘴，像是“大鼻子情圣”西拉诺的鸭舌帽一样，帽顶上写着“他们正在监视着你”。

Here is an example. Chico is supposed to spy on someone called Rufus T.Firefly.
Chico reports his progress to the man who asked him to spy on Firefly.
"The Jordanian and American intelligence services offered me millions of dollars to work with them and spy on mujahadeen here,".

Technology can also make frighteningly efficient tools for governments to surveil and spy on its citizens.
FORBES: Lawmakers Propose Changes To Make Government Get Warrant Before Reading Your Email