You can be alert, even though the intensity of the stimulus is quite low.
即使刺激的强度很低，你也要保持警惕。
We must be alert to the possibility of danger.
我们必须认识到危险的可能性。
It's a very intense job, and they have to be alert every moment.
这是高度集中的工作，他们需要时刻保持警惕。
Be alert to suspicious parcels.
小心可疑包裹。
请对此类电话保持警觉。
驾驶时保持警觉。
You must be alert to the hidden danger.
你必须对隐藏的危险保持警觉。
保持警惕，保持清醒。
We need to be alert to potential pitfalls.
我们需要警惕可能出现的隐患。
对此要保持高度的警觉。
A lot of people will be alert and waiting.
许多人都将提高警惕等待著。
This is the problem that we must be alert to.
这是值得我们保持警觉的问题。
An embarrassing situation might occur. Be alert!
提防尴尬的事会随时发生。
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。
Then be alert. Think about what they need from you.
然后保持机敏地思考他们需要你的什么帮助。
That cues your biological clock that it's time to be alert.
这暗示你的生物钟，它的时间要警惕。
As you look at your listeners, be alert for their reactions.
在看你的听众时，要注意他们的反应。
Yes, dear ones, be alert, for this year will be very special.
是的，亲爱的，坚持谨防，因为本年将相当的格外。
Be alert: if you feel ill, talk to someone about your worries.
保持警觉：如果你感觉不好，把你的烦恼倾诉掉。
You need to be alert, keep calm, think clearly, act decisively.
你必须时刻警惕，头脑冷静，思维清晰，行动果敢。
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。
The poor children early take charge, but must be alert to "let""
穷人的孩子早当家，但必须警惕“人穷志短”。
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。
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。
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。
In our reading we should always be alert for idiomatic expressions.
我们在阅读过程中应经常注意惯用法。
In our reading we should always be alert for idiomatic expressions.
我们在阅读过程中应经常注意惯用法。
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