在英文中，"不报警"的意思可以用 "not raise an alarm" 来表示。这个短语的来源可能是指当发生危险或紧急情况时，人们通常会发出警报声，或按下警报器来提醒周围的人，表明发生了危险或紧急情况。因此，"不报警"就是指在危险或紧急情况下，并没有发出警报声或按下警报器。
下面是一些使用 "not raise an alarm" 的例句，并附有中文翻译：
The security guard didn't raise an alarm when he saw the suspicious person on the surveillance camera. (保安在监控摄像机上看到可疑人物时并没有报警。)
The fire alarm didn't go off, so no one knew there was a fire until it was too late. (消防警报器没有响起，所以没人知道有火灾直到为时已晚。)
The burglar alarm didn't trigger, so the thief was able to break in without being detected. (防盗警报器没有触发，所以小偷能够在未被发现的情况下闯入。)
希望这些例句能帮助你理解 "not raise an alarm" 的意思。
下面是一些使用 "not raise an alarm" 的例句，并附有中文翻译：
The security guard didn't raise an alarm when he saw the suspicious person on the surveillance camera. (保安在监控摄像机上看到可疑人物时并没有报警。)
The fire alarm didn't go off, so no one knew there was a fire until it was too late. (消防警报器没有响起，所以没人知道有火灾直到为时已晚。)
The burglar alarm didn't trigger, so the thief was able to break in without being detected. (防盗警报器没有触发，所以小偷能够在未被发现的情况下闯入。)
希望这些例句能帮助你理解 "not raise an alarm" 的意思。