今天我们要学的词是 surveillance. Surveillance 监控。在波士顿马拉松爆炸案的侦破中，Extensive footage from surveillance cameras in the area of the blast provided vital clues for the police。爆炸现场附近监视摄像头录下的大量录像为警方提供了重要线索。While expanding surveillance cameras' usage has great potential for solving crimes, critics argue it will lead to a loss of privacy for lawful citizens. 尽管增加监视摄像头的确会对破案有极大帮助，但是批评人士说，这同时也会让守法公民的隐私受到伤害。好的，今天我们学习的词是 surveillance, surveillance, surveillance...