To find the easier solution, you need to be alert for a lazier way.
寻找简单的方法，你需要警惕懒惰的方法。
They want to be on the alert for similar buying opportunities.
他们要准备应对类似的购买机会。
Police are warning the public to be on the alert for suspicious packages.
警方警告公众要警惕可疑包裹。
Police are warning the public to be on the alert for suspicious packages.
警方警告公众要警惕可疑包裹。
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