We should keep clear minds.

我们必须保持清晰的头脑。

Keep clear of the door of the elevator.

不要靠近电梯的门。

Please keep clear from the security line.

请站在警戒线以外。

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 propeller while making the adjustments.

保持清醒的螺旋桨，而作出的调整。