(1) 白天(昼)(time of light between sunrise and sunset) [U]：The sun gives us light during the～. 白天太阳给我们光明。When he woke up， it was already～. 他醒来时已经是白天了。D～broke/dawned.天破晓。on a～like this 在这样的一天里;a fine/wet/rainy/cloudy～晴天/雨天/雨天/多云的一天; work/read/sail all～(long)(the whole～long)整天(整天)工作/读书/航行;work/study/travel～and night(or night and～)日夜工作/学习/旅行;can see by～， but not by night 白天看得见，晚上不行; work by～and sleep by night 白天工作晚上睡觉;a～nursery/school/shift 日托托儿所/日校/白班;〖反〗night;

(2)(一)天(昼夜)(period of 24 hours from one midnight to the next) [C]：There are twenty-four hours in a～and seven～s in a week. 一天有24个小时，一周有七天。What～of the week/the month is it? 今天是星期几/几号? What～is it today? 今天星期几? be ill/away for three～s 生病/离开三天;many～s ago 许多天以前;in two～s' time 两天后;in a～or two一两天后;work/wait～after～日复一日地工作/等待;grow/improve～by～(from～to～) 一天天地(一天天地)成长/好转;the～before yesterday 前天;the～after tomorrow 后天;I saw him the other～. 不久前某天我见过他。D～in，～out， I walk ten miles. 我每天步行10英里，天天如此。this～week/fortnight 一周/两周后的今天;It's three years to the～since we met. 自从我们相遇正好三年整了。from one～to the next 一连两天;

(3)(特别的)一天(particular day or date) [C]：What～is her birthday? 哪天是她的生日? graduation～毕业日;Christmas D～圣诞节;New Year's D～元旦;〖同〗date;

(4) 工作日(part of the day when one works or studies) [C]：work an 8-hour～每天工作八小时;Her working～is seven hours. 她一天工作七小时。The school～ends at 3 o'clock. 学校的一天学习下午3点结束。pay by the～按日付酬; have a hard ～at the office 在办公室工作很累;have a good～'s work 足足干了一天;Your ranching ～s are over. 你在农场劳动的日子结束了。call it a～结束一天的工作;〖同〗workday;

(5) 日子，时期(代)(particular period of time; age; era) [C， the～， 常pl]：It was popular in his～.在他那个时代这很流行。the man/problem/magazines of the (our)～当代(我们今天)的风云人物/问题/杂志;at the present～在现代;in my grandmother's～在我祖母的时代;To this～， I still don't know. 我至今仍不知道。in the～s of Queen Victoria/Dickens/steam-power/automobiles 在维多利亚女王/狄更斯/蒸汽机/汽车时代;in medieval～s 在中世纪时期;in those/these～s 在那个时代/当今;in the old～s/in～s of old从前;in one's school/student～s 在中学/学生时代;〖同〗period， time， age;

(6) 成功(名)之日(period of success or fame) [C]：Every dog has its～. 人人都有得意之时。Steam trains have had their～. 蒸汽机车已经过时了。The famous actor has had his～now. 那位著名演员的颠峰时期已经过去了。

(7) 战斗(时期)，竞赛(时期)((period of)struggle， battle or competition) [U， the～]：We've won/lost the～. 我们赢/输了。They carried the～. 他们获胜了。

one day 有朝一日：One～I'll have a house of my own. 总有一天我会有自己的房子 。

some day 改天，将来某天：We must get together again some～. 改天我们应该再相聚。

make sb's day(infml)使某人很快活： Go and tell her the good news — it'll make her～. 去告诉她这个好消息，这会使她非常快活的。

sb's/sth's days are numbered 气数将近，死期不远：The～s of the old man/the old school building are numbered. 那老人没几天活头了/旧校舍快要倒塌了。

→′dayboy， ′daygirl n 走读生;′day-school n 日校;′daybreak n 破晓;′daydream n 白日梦;vi 做白日梦;′day-long adj & adv 整日的(地);′daylight n 日光，白昼光;黎明，天亮;′daytime n 白天，日间;′daily adj，adv & n