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at Whitsun
at Whitsun 用作时间状语，指圣灵降临节或该节日所在的假期，通常不加 the。
The office is closed at Whitsun.
办公室在圣灵降临节期间关门。
圣灵降临节；降灵节
Whitsuns — plural of whitsun
先理解核心含义，再看它在真实句子里的用法。
圣灵降临节；降灵节
A Christian holiday; the week beginning on Whitsunday, especially the first three days.
The office is closed at Whitsun.
办公室在圣灵降临节期间关门。
五旬节。
Whitsunday.
从五旬节开始的假日。
The holiday beginning on Whitsunday.
Whitsun always feels like the beginning of summer to me.
圣灵降临节对我来说总像是夏天的开始。
We are going to spend Whitsun with our grandparents.
我们打算和祖父母一起过圣灵降临节。
The village holds an annual market at Whitsun.
每年圣灵降临节，这个村庄都会举办一年一度的集市。
at Whitsun 用作时间状语，指圣灵降临节或该节日所在的假期，通常不加 the。
The office is closed at Whitsun.
办公室在圣灵降临节期间关门。
Whitsun 可作定语修饰名词，常见搭配包括 weekend、holiday 等。
We spent the Whitsun weekend at the beach.
我们在海边度过了圣灵降临节周末。
Not this
We have a long weekend at whitsun.
Use this
We have a long weekend at Whitsun.
Whitsun 是专有名词，指圣灵降临节期间，首字母必须大写，不能写作小写 whitsun。
Not this
We had a family picnic in Whitsun.
Use this
We had a family picnic at Whitsun.
表示在某个节期时，英语用 at（如 at Easter、at Christmas、at Whitsun），不用 in；in 用于月份、年份或季节。中文“在降灵节”的“在”不能直接对应 in。
Not this
Whitsun is the day when the Holy Spirit came down.
Use this
Whitsunday is the day when the Holy Spirit came down.
Whitsun 指从 Whitsunday 开始的节期，尤其前三天，不指单日；单指圣灵降临日应当用 Whitsunday，二者不能混用。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
圣灵降临节公共假日
The Whitsun bank holiday is a popular time for short breaks.
圣灵降临节公共假期是短途旅行的热门时间。
圣灵降临节周末
We are going to the countryside for the Whitsun weekend.
我们打算去乡下过圣灵降临节周末。
圣灵降临节后的星期一
In some European countries, Whitsun Monday is a public holiday.
在一些欧洲国家，圣灵降临节后的星期一是公共假日。
在圣灵降临节期间
The school holidays begin at Whitsun.
学校假期在圣灵降临节期间开始。
圣灵降临节周
The Whitsun week includes several processions.
圣灵降临节周有几场游行。
那个降灵节，我动身晚了。
The Whitsun weekend was the start of his summer trip.
降灵节周末是他夏季旅行的开始。
Use Whitsuns naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
把 whitsun 拆成 white（白）+ sun（太阳）：想象白色太阳下人们穿白衣过圣灵降临节，记住这个词。
语域：neutral 常见场景：religious festivals、traditional holiday periods 该词通常指圣灵降临节或圣灵降临周，多用于英国英语；常见搭配如 Whitsun weekend、Whitsun holiday。在宗教或假日语境中较为常见，属于中性偏正式用语。
通常写作 Whitsun，首字母大写。
Dictionary facts from ECDICT, WIKTIONARY.