今天我们要学的词是alert。 Alert, 警戒，警报。 "The National Weather Service put the area under a tornado alert until 7 o'clock tonight," 国家气象局对本地发布龙卷风警告，晚上七点钟解除。 "The police sent out a crime alert after 10 reported break-in cases in the area," 当地连续发生了十起入室抢劫案后，警察向居民发出警告，要他们加倍小心。 "The United States issued an alert on Sunday, warning Americans of possible terrorist attacks in Europe," 美国政府星期天发出警告，让美国人对欧洲可能发生的恐怖袭击提高警惕。好的，今天我们学习的词是alert...