1
nightlong + noun
nightlong 通常作定语，修饰名词。
They embarked on a nightlong journey.
他们开始了一整夜的旅程。
整夜的；通宵的
先理解核心含义，再看它在真实句子里的用法。
整夜的；通宵的
Lasting for one entire night; lasting all night.
They embarked on a nightlong journey.
他们开始了一整夜的旅程。
整夜的；持续一夜的
Lasting a night (i.e. the duration of one night); lasting all night.
After a nightlong meeting, the team finally reached a consensus.
经过一夜的会议，团队终于达成了共识。
The nightlong celebration ended with a beautiful sunrise.
通宵的庆祝活动以美丽的日出结束。
She managed to finish the report after a nightlong effort.
经过一夜的努力，她完成了报告。
nightlong 通常作定语，修饰名词。
They embarked on a nightlong journey.
他们开始了一整夜的旅程。
作表语的用法较少见，但语法上成立。
The vigil was nightlong.
守夜活动是通宵的。
Not this
We worked nightlong to finish the project.
Use this
We worked all night to finish the project.
nightlong是形容词，不能作状语修饰动词；应使用all night作为时间状语。
Not this
The nightlong was very tiring.
Use this
The all-night party was very tiring.
nightlong是形容词，不能作名词；应使用'all-night + 名词'结构。
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通常作定语
Dictionary facts from ECDICT, WIKTIONARY.