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
先理解核心含义，再看它在真实句子里的用法。
哨兵；卫兵；守望者
A sentry, watch, or guard; a person employed to keep watch for some anticipated event.
The sentinel stood guard at the entrance all night.
哨兵整夜在入口处站岗。
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.
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。
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。
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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。
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。
Use sentinels naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
记忆联想：sentinel 拆成 sent + in + el，哨兵被派去(sent)守在里面(in)，警觉瞭望。
语域：mixed 常见场景：军事或文学语境、计算机编程与数据处理、公共卫生与医学 该词作名词时语域随语境变化：军事或文学中多用于书面语，偏正式；计算机与数据处理领域属于专业术语；公共卫生中可指健康风险标志。日常对话中若指“哨兵/守卫”，guard 是比较常见的替代词。
None of these is a full rhyme with sentinel /ˈsɛntənəl/. Sentry, sentence, and sentiment genuinely match only its opening /sɛnt/. Sensitive is a useful spelling lookalike but is pronounced /ˈsɛnsətɪv/, not /ˈsɛntə-/. Kennel and channel share the written ending -nel but have different vowels: /ˈkɛnəl/ and /ˈtʃænəl/.
Dictionary facts from ECDICT, WIKTIONARY.