At the outset, it seemed necessary to be on guard against the other two.
一开始，似乎有必要提防另外两个。
We should be on guard against such people.
我们应警惕这种人。
We must be on guard against hidden enemies.
我们必须警惕暗藏的敌人。
Always on guard against shadowing submarines.
时刻警惕跟踪的潜艇。
We have to be on guard against information theft.
我们必须警惕反对信息偷盗。
We should be on guard against the enemy's invasion.
我们要防范敌人的入侵。
Be on guard against those who are jealous of your success.
要提防那些嫉妒你的成功的人。
Thus, you should be on guard against this confused mapping.
因此，您应该谨防这种有混淆的映射。
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 citizens were warned to be on guard against a sudden night attack.
市民们得到通知，要提防夜间的突然袭击。
Be on guard against those who try to lie themselves into our confidence.
要警惕那些试图用谎言来骗取我们信任的人。
Be on guard against those who try to lie themselves into our confidence.
警惕那些用谎言来骗取我们信任的人。
The police warned people to be on guard against burglary during the festival.
警察提醒人们假日里要注意提防盗窃。
They just are on guard against each other, let alone hope they can share with each other.
他们只是相互提防，更不用说希望他们能互相分享。
The armed forces were on high alert to guard against any retaliation.
武装部队保持高度警惕，以防发生任何报复行为。
Be on your guard against pickpockets.
提防扒手。
We need to guard against a lack of imagination on not only what could go wrong, but also what could go right in this environment.
我们不仅要防范对可能错误的操作估计不足，还要防范在这种环境下对可能正确的操作估计不足。
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。
We must be on our guard against pickpockets on a bus.
在公交车上我们要小心扒手。
Against that dreadful design the church stands ever on guard.
对于这个可怕的计谋，教会是时刻提防的。
你们要提防她。
Please guard against pickpockets on the bus.
在公共汽车上要谨防扒手。
Use sunscreen on your skin to guard against skin cancer.
为了防止皮肤癌，要涂上防晒霜。
I am always on my guard against him.
我随时都在提防他呢。
Be on your guard against those who are jealous of your success.
要提防那些嫉妒你的成功的人。
On the one hand, you guard against the attack.
一方面，你保护自己免受攻击。
Have you not learned enough of Grecian fraud to be on your guard against it?
你们对希腊人的诡计知道得还不够吗？
Have you not learned enough of Grecian fraud to be on your guard against it?
你们对希腊人的诡计知道得还不够吗？
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