We must be alert to the possibility of danger.
我们必须认识到危险的可能性。
This is the problem that we must be alert to.
这是值得我们保持警觉的问题。
We must be alert, dexterous and positive …"…"
我们必须有所警示，灵活，积极…
Every situation is unique, and we must be alert to its uniqueness.
其实，每个情景都是独特的，我们必须对其独特性保持警觉。
We must be constantly alert to this danger.
对此，我们必须保持高度的警惕。
However, we also must be alert to the risk of death to the instrument.
然而，我们也必须要警觉到仪器致死的危险。
We must be on the alert to discharge our responsibilities toward the friendly countries.
我们必须警惕自己放弃对友好国家的责任的做法。
We must be on the alert to discharge our responsibilities toward the friendly countries.
我们必须警惕自己放弃对友好国家的责任的做法。
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