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post/station a sentry (+ prep phrase)
They posted a sentry at the gate.
他们在门口设了一名哨兵。
哨兵, 看守
先理解核心含义，再看它在真实句子里的用法。
哨兵, 看守
a person employed to keep watch for some anticipated event
They posted a sentry at the gate.
他们在门口设了一名哨兵。
守卫军事基地入口的哨兵
A guard, particularly on duty at the entrance to a military base.
被雇来守望预期事件的人
a person employed to keep watch for some anticipated event
哨兵值勤；担任哨兵的时间
Sentry duty; time spent being a sentry.
一种水下拖曳的阻力装置,触底后翻转并浮出水面
A form of drag to be towed underwater, which on striking bottom is upset and rises to the surface.
The sentry stood guard at the gate, watching for any unauthorized vehicles.
哨兵在大门口站岗，监视任何未经授权的车辆。
A lone sentry patrolled the perimeter of the military camp during the night.
夜间，一名孤独的哨兵在军营周边巡逻。
The general ordered the sentries to double their vigilance after the recent threat.
将军命令哨兵们在最近的威胁之后加倍警惕。
They posted a sentry at the gate.
他们在门口设了一名哨兵。
sentry 作定语时通常表示与哨兵相关的物品或职责。
The sentry box was painted red.
哨兵岗亭被漆成了红色。
动词用法较少见，通常用于军事语境。
The soldiers sentried the perimeter.
士兵们在周边设了岗哨。
Not this
There are two sentry at the gate.
Use this
There are two sentries at the gate.
Sentry 是可数名词，复数形式是 sentries。句子中 two 表示复数，所以应该用复数形式。
Not this
He sentries the gate.
Use this
He stands sentry at the gate.
Sentry 作为动词使用不自然且罕见，常用短语 stand sentry (at) 表示‘站岗’。直接用作动词不符合英语习惯。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
站岗，放哨
Two soldiers stood sentry at the gate.
两名士兵在大门口站岗。
哨兵勤务，站岗
He was assigned to sentry duty for the night.
他夜间被指派站岗。
布置岗哨，设哨兵
The commander posted sentries around the perimeter.
指挥官在周边布置了哨兵。
换哨，接替哨兵
A guard came to relieve the sentry at midnight.
午夜时分，一名卫兵前来换哨。
岗亭，哨亭
The sentry stood inside a small sentry box.
哨兵站在一个小岗亭里。
哨位，岗哨位置
No one is allowed to leave the sentry post without permission.
未经允许，任何人不得离开哨位。
站岗；放哨
A soldier stood sentry at the gate.
一名士兵在大门口站岗。
Use sentry naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
联想：sentry 听着像“sent tree”（派来的一棵树）——哨兵站岗纹丝不动，像树一样立在哨位。
语域：formal 常见场景：military base、guard duty、formal writing sentry 是比较正式的用语，通常用于军事或正式书面语境，指在基地入口等处站岗的卫兵；日常口语中更常说 guard。
名词可数；动词及物/不及物
Dictionary facts from ECDICT, WIKTIONARY.