vi., vt.spied, spying1. 窥探;秘密监视to spy into other people's affairs窥探他人的事务
Have you been spying on me?你一直在暗中监视我吗?
He said that someone might be spying on the station and the pilot was ordered to keep track of the strange object.他说可能有人对基地进行侦察,于是便命令该飞行员跟踪这个怪物。
2. 侦察;侦探3. 看见;发现