On guard
其它 Other在岗, 警惕
📝 例句
Be on guard against those who are jealous of your success.
要提防那些嫉妒你的成功的人。
He is most free from danger, who even when safe, is on guard.
居安思危，最为保险。
We must be on guard not to let the enemy spies worm in.
我们必须警惕,不让敌特钻进来。
The man below there are always on guard.
下面的人又总是片刻不离地守着。
And right off I was on guard against Mencken's books.
我马上就对门肯的书警觉起来了。
🧩 词语组成解析
on
[ɑn]
prep. （表示方向）向;（表示对象）对;（表示位置）在…上;（表示时间）在…之时;
adv. （放，穿，连接）上;向前，（继续）下去;
adj. 活动着的情况，状态;使用着的;发生着的;计划中的;
guard
[ɡɑrd]
n. 警卫;狱吏，看守;护卫队;防护装置;
vt. 保卫，守护;看守;加防护装置;谨慎使用;
vi. 警惕;警卫;
🗣️ 情景例句
Hand me two eggs from the refrigerator,
替我从冰箱拿两个蛋来。
The law is not the same at morning and at night.
早上的法令跟晚上的不一样；朝令夕改。
We had expected much lower prices.
我们希望报价再低一些。