a guard against sth
guard 在此作可数名词，against 后接所要防范的事物。
Regular exercise is a good guard against heart disease.
经常锻炼是预防心脏病的好办法。
守卫；护卫队；保护物
guards — plural of guard
防护装置；防护罩；戒备；防卫；护具；护膝；护腿；（篮球）后卫；（美式橄榄球）护锋；进攻后卫
A person, group, or thing that protects or watches over someone or something.
保护或看守某物的人或物
A person who, or thing that, protects or watches over something.
看守某物或某人的人
a person who keeps watch over something or someone
负责保护某物的小队
A squad responsible for protecting something.
橄榄球队中担任该位置的人
the person who plays that position on a football team
剑柄护手
The part of a sword that protects the wielder's hand.
防止伤害或事故的装置
a device designed to prevent injury or accidents
机器的防护罩
A part of a machine which blocks access to dangerous parts.
怀表链
A watchchain.
警戒状态；防御姿态
A state of caution; posture of defence.
护具,如板球护腿
Something worn to protect part of the body, e.g. the shins in cricket.
篮球中距离篮筐较远的矮个子球员
A relatively short player, playing farther from the basket than a forward or centre.
板球击球手在击球线上的站位标记
The position on the popping crease where a batsman makes a mark to align himself with the wicket; see take guard.
橄榄球中保护四分卫和开辟跑动路线的进攻位置
Either of two offensive positions between the centre and each of the offensive tackles, whose main responsibilities are to protect the quarterback, and open up "holes" through which offensive players can run.
地面缠斗中用腿控制对手的姿势
A ground grappling position in which one combatant has their back to the ground while attempting to control the other combatant using their legs.
担任后卫位置的球员
A player playing a position named guard.
负责列车安全的列车员,通常在列车最后一节车厢
An employee, normally travelling in the last vehicle of a train, responsible for the safety of the train.
程序执行分支继续的布尔表达式
A Boolean expression that must evaluate to true for a branch of program execution to continue.
飞机紧急频率,通常为民用的121.5MHz
The aircraft emergency frequency, a radio frequency reserved for emergency communications, typically 121.5MHz for civilian use.
The guard checked my ID before allowing me to enter the building.
保安在允许我进入大楼之前检查了我的身份证。
用法提示：此句中 guard 是名词，意为“保安”，指负责安全检查的人。
AI contextual example
As a guard, his main duty is to protect the quarterback.
作为后卫，他的主要职责是保护四分卫。
用法提示：此句中 guard 是名词，意为“（足球）后卫”，指场上防守位置的球员。
AI contextual example
Always use a blade guard when operating the saw.
操作锯子时务必使用防护罩。
用法提示：此句中 guard 是名词，意为“防护装置”，指防止受伤的安全设备。
AI contextual example
guard 在此作可数名词，against 后接所要防范的事物。
Regular exercise is a good guard against heart disease.
经常锻炼是预防心脏病的好办法。
on guard 可指站岗值班；on one's guard 更强调提防、警觉。
The soldiers were on guard all night at the gate.
士兵们整夜在大门口站岗警戒。
off guard 只用于这一固定搭配，表示趁人不备、使人毫无防备。
Her sudden question caught me off guard.
她突然的提问让我措手不及。
under guard 表示处于被看守、被监视的状态，常与 keep、hold、place 连用。
The prisoner was kept under guard day and night.
那名囚犯日夜受到看守。
grammar · medium
易错句子My uncle is guard in a big company.
正确表达My uncle is a big company's guard.
guard 表示“保安、守卫”时是可数名词，单数形式泛指职业时必须带限定词，通常用不定冠词 a/an。汉语“我叔叔是保安”没有冠词，直译过来就会漏掉 a，所以要说 a guard。
grammar · medium
易错句子There are two guard at the front gate.
正确表达There are two guards at the front gate.
guard 是可数名词，前面有 two、three、many 等大于一的数词或复数限定词时，必须用复数形式 guards。汉语名词不标复数，学习者容易照字面保留原形。
保安员
The security guard checked my ID at the entrance.
保安员在入口处检查了我的身份证。
保镖
The celebrity hired a personal bodyguard for the event.
这位名人为活动雇了一位私人保镖。
看门狗
They have a guard dog to protect their property.
他们有一条看门狗来保护财产。
守卫任务
Soldiers are assigned to guard duty at the base.
士兵们被派往基地执行守卫任务。
岗亭
The guard station is located at the main gate.
岗亭位于正门。
护栏
The car crashed into the guard rail on the highway.
汽车撞上了高速公路上的护栏。
让某人措手不及
The question caught me off guard, and I didn't know how to answer.
这个问题让我措手不及，我不知道怎么回答。
站岗；守卫
Two soldiers stood guard at the entrance.
两名士兵在入口处站岗。
仪仗队
The president was greeted by a guard of honor at the airport.
总统在机场受到仪仗队的迎接。
卫兵宁死不降。
The guard stood watch at the castle gate all night.
卫兵整夜站在城堡门口守卫。
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Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY.