Always on guard against shadowing submarines.
时刻警惕跟踪的潜艇。
If we are alert enough, we'll notice that we are always on guard.
如果我们足够警惕，你会发现我们经常是在站岗。
The change of our living environment makes people always feel on their guard against others.
居住环境的改变，令很多居民对身边的邻居抱着提防之心，不少人都在心里上了一把“锁”，总有种不安全感。
I am always on-guard for thieves in my store.
我总是对进入我店里的小偷十分警觉。
I am always on my guard against him.
我随时都在提防他呢。
Consumers should always be on guard against credit card scams.
消费者必须经常提高警觉，以防各种信用卡诈骗。
The doctor must always guard against passing on disease to his family.
提防把疾病传染给他的家人。
The doctor must always guard against passing on disease to his family.
提防把疾病传染给他的家人。
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