Spy upon sb
暗中监视某人, 侦查某人
🧩 词语组成解析
upon
[ə'pɑn]
prep. 在…上面;当…时候;
[计] 栈底, 标准二进制, 减, 备用设备\\n[医] 锑(51号元素)
🗣️ 情景例句
How fresh are these vegetables?
这些蔬菜有多新鲜？
What is done by night appears by day.
若要人不知，除非己莫为。
It can be unpleasant to live even several miles from an aerodrome;
即使住在离机场几英里以外的地方，机场的噪音也会使人难受。