Word · Frequency #2073
dec
十二月
核心释义
the 12th and last month of the year; December
- 1.
美国数字电子公司；[计] 数字设备公司
n the last (12th) month of the year；n (astronomy) the angular distance of a celestial body north or to the south of the celestial equator; expressed in degrees; used with right ascension to specify positions on the celestial sphere
赤纬；美国数字电子公司；[计] 数字设备公司
用法In use
I need to know the star's dec before I set up the telescope.
用法提示：dec 是 declination（赤纬）的缩写，在句中作名词。
The star chart lists each star's right ascension and dec.
用法提示：dec 在句中作名词，与 right ascension（赤经）并列，指 declination（赤纬）。
Can you look up the dec of that planet in the sky atlas?
用法提示：dec 在句中作名词，表示 declination（赤纬）。
in Dec / on [date] Dec
Dec 通常大写，表示十二月。
The conference is scheduled for Dec 5th.
会议定于12月5日举行。
dec of [celestial object]
在上下文中，dec 表示 declination（赤纬），首字母通常小写。
相关词与表达Connections
搭配Collocations
- in Dec
- 在十二月
- The conference is in Dec.会议在十二月。
- Dec 25
- 12月25日
- We have a party on Dec 25.我们在12月25日有个派对。
- north dec
- 北赤纬
- The star's north dec is 45 degrees.这颗星的北赤纬是45度。
- dec angle
- 赤纬角
- The dec angle is measured from the celestial equator.赤纬角从天赤道测量。
- DEC computer
- 数字设备公司计算机
- He used a DEC computer at work.
学习提示Learner notes
记忆技巧Memory Tip
DEC 是十二月缩写，联想 '底刻'，象征一年底部的重要时刻。
语境与语域Context & Register
用于表示十二月，常见于日期、日历、计划等书面缩写，语境中性偏正式。
语法说明Grammar Note
Dec是December的缩写，也是天文学中赤纬的符号，作名词时通常可数。
发音与拼写Pronunciation & Spelling
All listed words rhyme with /dɛk/, the pronunciation of 'dec' when used as an abbreviation for 'declination' or 'December' in informal contexts. However, 'dec' for 'December' is often said as the full word /dɪˈsɛmbər/, which does not rhyme. Words with '-eck' and '-ech' are spelling variations; only 'spec' shares the exact '-ec' spelling ending.
用法优先级Usage priority
Collins 词频等级为 2，建议结合例句记忆，而不是只背中文释义。
Dictionary facts from ECDICT, WIKTIONARY.