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1·You must keep alert in class.

你们应该在课堂上保持活跃。

2·Choose wisely and keep alert.

明智选择，保持警醒。

3·Keep alert at night!

晚上要保持警惕！

4·You must keep alert in the English class.

你们应该在英语课上保持活跃。

5·Keep moving, keep low, keep quiet, keep alert!

保持移动，保持低调，保持安静，保持警戒！

6·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。

7·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。

8·Keep alert to the information of related party when inspecting records or documents.

在检查记录或文件时对关联方信息保持警觉。

9·At Maker Faire, it's important to keep alert, as you never know what might drive by at high speed.

在设备自由放任，重要的是要保持警觉，因为你永远不知道什么可以高速驾驶的。

10·Also keep alert for Australian building approvals on Wednesday and PMI data out of China on Thursday despite a national holiday.

请同样关注澳大利亚定于周三出炉的营建许可，还有中国将于周四揭晓采购经理人指数，虽然接下来将迎来国庆假期。