吃透英语课本，提升在校竞争力
phrase. 侦查；暗中监视
"An officer cannot use our product to spy on his wife, for example," Mr. Valleri said.
瓦利瑞解释说：例如，一个政府官员不能用我们的产品暗中监视他的妻子。
He used binoculars to spy on the birds.
他用双筒望远镜偷看那些鸟。
He tried to spy on his neighbors.
他试图监视他的邻居。
