We must be alert to the possibility of danger.

我们必须认识到危险的可能性。

We must be alert to these signals and respond with the compassion and care that are hallmark traits of what it means to be a woman, anywhere, everywhere.

我们必须警惕这些信号，以同情和关爱来回应，这些信号是标志性特征，说明在任何地方、在所有地方做女人意味着什么。

Be alert to suspicious parcels.

小心可疑包裹。

You must be alert to the hidden danger.

你必须对隐藏的危险保持警觉。

We need to be alert to potential pitfalls.

我们需要警惕可能出现的隐患。