我们必须保持清晰的头脑。
Please keep clear from the security line.
请站在警戒线以外。
When I stay up in the night, I always drink coffee to keep clear-headed.
我彻夜熬夜的时候，经常喝咖啡来保持清醒。
Consumers should keep clear mind at time of shopping.
消费者们在购物时应保持清醒的头脑。
Keep clear of the door of the elevator.
不要靠近电梯的门。
Keep clear of the door of the elevator.
不要靠近电梯的门。
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