stand sentinel
collocation站岗；放哨；守卫
Soldiers stood sentinel at the gate.
士兵们在大门站岗。
哨兵；卫兵；守望者
sentinels — plural of sentinel
哨兵值；标记值；健康风险征兆；警示信号；大眼蟹；哨兵,守卫；受雇守望预期事件的人
A sentry, watch, or guard; a person employed to keep watch for some anticipated event.
哨兵,守卫
A sentry, watch, or guard.
受雇守望预期事件的人
a person employed to keep watch for some anticipated event
计算机程序中用于特殊处理或标记数据集结束的独特值
A unique value recognised by a computer program for processing in a special way, or marking the end of a set of data.
哨兵蟹
A sentinel crab.
健康风险的标志(例如疾病,不良反应)
A sign of a health risk (e.g. a disease, an adverse effect).
The sentinel stood guard at the entrance all night.
哨兵整夜在入口处站岗。
用法提示：sentinel作名词，表示站岗的哨兵。
Ancient cities often had sentinels posted on the walls to watch for approaching enemies.
古城常常在城墙上布置哨兵，监视接近的敌人。
用法提示：sentinel复数形式sentinels，指多个哨兵。
During the camping trip, we took turns being sentinel to keep the fire going.
露营期间，我们轮流担任哨兵以保持火不灭。
用法提示：sentinel作可数名词，表示轮流值守的人。
最通用，可指保安、卫兵，不限于站岗；sentinel 更正式且带警戒意味。
与 sentinel 最接近，特指军事岗哨，日常语境不常用。
侧重夜间看守房屋或工地，无军事含义，语气较具体。
强调观察远处或高处，常搭配 keep a lookout，不一定持武器守卫。
本义为“进攻者”，与 sentinel（哨兵/守卫）相对；sentinel 负责防守与警戒，attacker 则主动发起进攻。
本义为“未经许可进入的人”，与 sentinel（守卫/守望者）相对；sentinel 的职责正是发现并拦截 intruder。
站岗；放哨；守卫
Soldiers stood sentinel at the gate.
士兵们在大门站岗。
哨兵值；标记值
The program uses -1 as a sentinel value to mark the end of input.
该程序用 -1 作为哨兵值，标记输入结束。
前哨淋巴结
The surgeon checked the sentinel node for signs of cancer.
外科医生检查前哨淋巴结是否有癌症迹象。
警讯事件；重大安全事件
The hospital reported a sentinel event to the health authority.
医院向卫生部门报告了一起警讯事件。
指示物种；哨兵物种
Canaries were once used as sentinel species in coal mines.
金丝雀曾被用作煤矿中的指示物种。
设置哨兵；布置岗哨
They posted sentinels along the ridge.
他们在山脊沿线布置了哨兵。
与 sentinel 同属监视与守卫概念，但强调移动巡查而非固定守望。
供哨兵等人员瞭望敌情或险情的设施，与 sentinel 的守卫功能直接相关。
哨兵发现危险时发出的警告信号，体现 sentinel 的预警作用。
更为广泛的监控活动，sentinel 可视为其中承担固定观察任务的角色。
用于传递警告或指示的信号装置，与 sentinel 的警示功能相似。
站岗；守卫；守护
The old lighthouse still stands sentinel over the harbor.
那座古老的灯塔仍然守护着海港。
Choose the next layer that will help you use sentinels with more confidence.
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Preparing Usage patterns
Complete this area with usage patterns.
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Dictionary facts from ECDICT, WIKTIONARY.