guarded
adj. （人或言语）谨慎的，有保留的；被监视着的；警戒着的；被看守着的
v. 保卫，看守（guard的过去式和过去分词）
例句
Marines with rifles guarded them.
持步枪的海军陆战队士兵看守他们。
《柯林斯英汉双解大词典》
The prisoners were guarded by soldiers.
犯人由士兵看守。
《牛津词典》
You can't get in; the whole place is guarded.
你进不去，整个地区都戒备森严。
