短语词组短语be alert to something 能够觉察的Be alert to safety 工作中注意安全Be alert to sth 对Be Alert to Product Placement 警惕产品内置To Be Highly Alert 值得高度警惕to be alert for 警戒to be alert against 防范Enable me to be alert 使我是这般警觉 返回 be alert to