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(1)夜晚(period between sunset and sunrise，especially the hours of darkness)[C，U]：at/by/over～夜里/夜間/過夜;during/in/throughout the～ 夜間/夜里/通宵;under the cover of～趁夜;an early/a late～睡得比平時早/晚;all～整夜地;day and～日夜地;～after～一夜一夜地;have a～out 在外過一整夜;have a good (bad)～ 一夜睡得好(不好)，turn～into day 挑燈夜戰(zhàn); make a～of it 玩?zhèn)€通宵;The～grows late.夜深了。N～is falling.夜幕降臨。They often work far into the～. 他們常常工作到深夜。

(2)夜晚的活動(evening or night devoted to some special purpose or event)[C;U]：the opening (last)～of a play 某戲劇的首(末)場演出;They can serve over 1500 customers on a big～. 忙的時候他們一晚上可供應1500位客人以上。We had a Mozart～yesterday evening. 昨晚我們聽了莫扎特音樂專場。

→′nightly adj 晚上的，夜間的;每夜的;adv在夜間;每夜;

【用法】at night、by night、in the night、during the night、on a (...) night (...) 的用法不同。at night用于描述習慣上在天黑以后做的事：We sleep at night. (我們夜里睡覺。) by night 與at night同義，但在強調(diào)動作發(fā)生的條件或情況時使用，如：Summer temperatures here range from 25℃ by night to 32℃ by day. (這里的夏季氣溫夜間最低攝氏25度，白天最高攝氏32度。) in the night 通常指剛剛過去的夜晚，如：I fell asleep quickly，but deep in the night a thunderstorm awakened me. (我很快睡著了，但到深夜雷雨把我驚醒。) during the night 也可以表達這個含意，如：It rained during the night. (夜間下雨了。) on a (...) night (...) 表示更具體的夜晚，如：On the third night a blizzard struck. (在第三天夜晚來了一場暴風雪。)