你们应该在课堂上保持活跃。
明智选择，保持警醒。
晚上要保持警惕！
You must keep alert in the English class.
你们应该在英语课上保持活跃。
Keep moving, keep low, keep quiet, keep alert!
保持移动，保持低调，保持安静，保持警戒！
When it comes to a long drive, make sure to have ways to keep alert.
当长时间驾驶之后，一定要想办法保持清醒。
You must keep alert when you are in a completely unknown environment.
在一个完全陌生的环境里，你必须随时保持警惕。
Keep your body posture alert and confident.
保持体姿的警惕和自信。
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。
我们必须高度警惕。
Stay alert, keep calm, think clearly, and act decisively should be their motto.
保持警觉、遇事沉着、清醒思考、果断决策。
Keep them sharp, awake, alert.
让他们保持敏锐、警觉、机灵。
They keep your muscles energised and your mind alert.
能即时为肌肉提供能量并保持思维敏捷。
I will always keep myself mentally alert, physically strong, and morally straight;
我将使自己永远保持精神警惕，身体强壮，和品德正直。
Alert, you keep listening, until it sounds like a door is being opened.
马上惊醒，侧耳倾听，发现只是门开的声音。
Alert, you keep listening, until it sounds like a door is being opened.
马上惊醒，侧耳倾听，发现只是门开的声音。
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