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1·We must be alert to the possibility of danger.

我们必须认识到危险的可能性。《牛津词典》

2·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。

3·Be alert to suspicious parcels.

小心可疑包裹。

4·You must be alert to the hidden danger.

你必须对隐藏的危险保持警觉。

5·We need to be alert to potential pitfalls.

我们需要警惕可能出现的隐患。

6·Be alert to this.

对此要保持高度的警觉。

7·This is the problem that we must be alert to.

这是值得我们保持警觉的问题。

8·The key to the method is to be alert to new words.

使用这个方法的关键是对生词的警觉。

9·Parents should be alert to these changes in a child's behavior.

家长应该警惕孩子这些方面的行为变化。

10·Parents should be alert to sudden changes in children's behavior.

父母应该留心孩子行为的突然变化。