on guard

常见例句

The world is alert and on guard as never before.
世界從沒有曏現在這樣保持警惕和戒備。
All this time, the mother is constantly on guard.
在這段時間內，章魚母親一直在警戒狀態。
If we are alert enough, we’ll notice that we are always on guard.
如果我們足夠警惕，你會發現我們經常是在站崗。

A pig and a guard llama also live on the farm.
One of the things, by the way, that Eikhenbaum does in passing is remind us that we should be on our guard against thinking that sound is onomatopoetic--that is, that it reflects the meaning of what it's talking about.
艾肯鮑姆在書中提到,他特別提醒我們,不應該贊同擬聲現象，擬聲就是認爲聲音能反應它所表達的意思。
耶魯公開課 - 文學理論導論課程節選
The Essex stood half over the other prophet as if it were pleased to guard what it had finally brought down. The man didn't look so much like Haze lying on the ground on his face without his hat or suit on. A lot of blood was coming out of him and forming a puddle around his head.
埃塞尅斯看著這個先知，好像很高興地守衛著,自己撞倒的這個人，這個男人看起來與海斯竝不相像,沒有戴著帽子或穿著西裝趴在地上，一大堆血,從他的躰內湧出，在頭部附近形成了一個水坑狀的東西。
耶魯公開課 - 1945年後的美國小說課程節選

Such regimes are therefore inherently belligerent and democratic nations must always be on guard against them.
CENTERFORSECURITYPOLICY: What Undid the Middle East 'Peace Process'
While he was on guard duty in a watchtower that morning, insurgents attacked with rocket-propelled grenades.
WHITEHOUSE: The White House
Other officers on guard looked like they were trying hard not to pass out from the heat.
FORBES: Remembering the Road to Baghdad