guard sb/sth
宾语可以是人、地点或入口；表示看守、守卫或保卫。
Two soldiers guard the entrance.
两名士兵看守入口。
看守；监视；警惕；防范；给…镶边；装饰…的边缘；束缚；系紧；束紧；保护免受危险；确保安全
To protect someone or something from danger or attack; to keep safe.
保护免受危险；确保安全
To protect from danger; to secure against surprise, attack, or injury; to keep in safety; to defend.
看守以防止逃跑或暴力行为
To keep watch over, in order to prevent escape or restrain from acts of violence, or the like.
警戒或防御；保持警惕
To watch by way of caution or defense; to be cautious; to be in a state or position of defense or safety.
用装饰边保护边缘
To protect the edge of, especially with an ornamental border; hence, to face or ornament with lists, laces, etc.
用绑带固定
To fasten by binding; to gird.
一般现在时
I guard the door every night.
我每晚守卫大门。
一般过去时
She guarded the entrance yesterday.
她昨天守卫了入口。
现在完成时
They have guarded the treasure for years.
他们守卫宝藏已有多年。
规则动词，过去式加-ed。
The security guard guards the entrance every night.
保安每晚守卫入口。
用法提示：动词guards表示守卫动作
She guarded her younger brother from the angry dog.
她保护弟弟免受那条愤怒的狗的攻击。
用法提示：动词过去式guarded表示保护行为
You should guard your password carefully.
你应该小心保护你的密码。
用法提示：动词原形guard表示防备措施
宾语可以是人、地点或入口；表示看守、守卫或保卫。
Two soldiers guard the entrance.
两名士兵看守入口。
against 后接要防范的危险、疾病或错误等。
Wash your hands to guard against infection.
勤洗手以防感染。
也可说 guard sb/sth from sth，但 against 更常见。
The vaccine guards children against measles.
这种疫苗保护儿童免受麻疹侵害。
grammar · medium
易错句子We should guard the danger of fire.
正确表达We should guard against the danger of fire.
表示“防范、警惕”某种危险时，guard 是不及物用法，必须与介词 against 搭配：guard against + 名词/动名词。guard 后直接跟宾语时意思是“看守、保卫”某个具体对象（如 guard the door），不能用来表达“防范危险”，所以此句漏掉 against 后意思不成立。
grammar · medium
易错句子We must guard the environment from pollution.
正确表达We must protect the environment from pollution.
汉语“保护”使用范围很广，但英语 guard 侧重“看守、警戒”具体对象，以防其逃跑或受到袭击（如 guard the prisoner、guard the gate）。对抽象事物（环境、健康、权利等）的“保护免受伤害”要用 protect，搭配 protect sth from sth。
grammar · medium
易错句子We must guard against to catch a cold.
正确表达We must guard against catching a cold.
against 是介词，后面只能接名词或动名词（-ing），不能接动词不定式。因此 guard against 后要把动词改成动名词 catching，而不能用 to catch。
防范某事；预防某事
You should guard against making the same mistake again.
你应该防止再犯同样的错误。
保护某人免受某事（伤害）
The mother tried to guard her children from the harsh reality.
这位母亲试图保护孩子们免受严酷现实的影响。
看守大门
Two soldiers guarded the door to the meeting room.
两名士兵看守着会议室的大门。
保守秘密
She promised to guard the secret for life.
她承诺一生保守这个秘密。
保护个人隐私
It's important to guard your privacy online.
在网上保护你的隐私很重要。
与guard同属安全防护领域，guard作为动词时往往涉及提供或保障security。
巡逻是guard的一种常见方式，指来回巡查以守卫某地。
护送带有守卫性质，强调随行以保护安全。
监视是对区域或人员的持续观察，常与guard搭配使用。
guard要求保持警惕，vigilance是执行守卫时的心态或状态。
防范；防止
You should guard against making the same mistake again.
你应该防范再犯同样的错误。
用生命保护；极其珍视
She guards her diary with her life.
她极其珍视自己的日记，像保护生命一样。
说话谨慎；管住自己的嘴
He guarded his tongue during the heated argument.
在那场激烈的争论中，他说话非常谨慎。
你要保守你心，胜过保守一切，因为一生的果效是由心发出。
Parents always try to guard their children from danger.
父母总是努力保护孩子远离危险。
谁来守卫守卫者？
We must guard against complacency in our work.
我们必须防止在工作中自满。
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Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY.