1、Have you not learned enough of Grecian fraud to be on your guard against it?
你們對希臘人的詭計知道得還不夠嗎？

2、You must be on your guard against the dog.
你一定要防備那只狗。

3、I want you to be on your guard and watch your step from now on.
我要你從現(xiàn)在起注意提高警惕，步步當心。

4、So I want you to be on your guard and watch your step from now on.
因此，我要你注意檢點自己，從此以后，步步當心。

5、Be on your guard against copying and pasting code between parts of your application.
一定要注意，不要將代碼從應用程序的一部分復制粘貼到另一部分。

6、Be on your guard against a false sense of self-importance.
要時時警覺以對付虛假的自我重要感。

7、Be on your guard when people flatter you.
有人吹捧你的時候，千萬要當心。

8、Be on your guard against the woman; she'll do you down if she gets a chance.
你要提防那個女人，她一有機會就要欺騙你。

9、on guard against con artists; must remain on your guard in such a situation
警惕反對派藝術(shù)家；在這種情況下必須保持警惕。

10、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。

11、Be on your guard against her.
你們要提防她。

12、Be on your guard against pickpockets.
提防扒手。