Stay sharp.

保持警惕。

Keep your eyes open.

注意周围。

Don't let your guard down.

别放松警惕。

Watch your back.

小心身后。

Heads up.

注意点。

Stay on your toes.

打起精神。

Be aware of your surroundings.

留意周围环境。

Don't get too comfortable.

别太放松。

Look alive.

精神点儿。

Stay frosty.

保持冷静。

Keep your head on a swivel.

保持警觉。

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