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1·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。

2·Two soldiers must be on guard all night.

两名战士必须通宵警戒。

3·I must protect myself and be on guard.

我必须保护自己、保持警惕。

4·Two soldiers must be on guard all night.

必须有两个士兵整夜站岗。

5·Be on guard. There are pickpockets around here.

要提高警惕，这里有扒手。

6·While danger threatens, we must all be on guard.

危险正在逼近，我们必须保持警惕。

7·While danger threat ens we must all be on guard.

危险正逼近，我们必须保持警惕。

8·We have to be on guard against information theft.

我们必须警惕反对信息偷盗。

9·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。

10·Be on guard against those who are jealous of your success.

要提防那些嫉妒你的成功的人。