動詞 guard:

1. to keep watch over
   同義詞：guard
2. watch over or shield from danger or harm; protect
   同義詞：guard, ward
3. protect against a challenge or attack
   同義詞：defend, guard, hold
4. take precautions in order to avoid some unwanted consequence
   同義詞：guard

形容詞 guarded:

1. prudent
   同義詞：restrained

1. The building is guarded by a fence and ten guard dogs.
   建筑物由籬笆和10條守衛(wèi)狗保護著。
2. All the approaches to the palace were guarded by troops.
   通往宮殿的所有道路都有部隊把守。
3. The prisoners closely guarded escaped from the prison last night.
   被嚴密監(jiān)視的這些囚犯昨夜越獄了。
4. The dog guarded the house against strangers.
   狗守衛(wèi)著房屋，不讓陌生人進去。

guard.ed

adj.（形容詞）
Protected; defended.
被保護的；被防衛(wèi)的
Watched over; supervised.
監(jiān)視的；監(jiān)督的
Cautious; restrained:
謹慎的；受限制的：
例句：
We view these changes with guarded optimism.
我們以審慎的樂觀看待這些變化

【引伸】
guard.edly
adv.（副詞）
guard.edness
n.（名詞）