1
a CD
CD是可数名词，可用不定冠词a修饰。
I bought a CD yesterday.
我昨天买了一张CD。
定期存单；存款证
先理解核心含义，再看它在真实句子里的用法。
定期存单；存款证
a bank-issued certificate for money deposited for a fixed term, usually paying interest
I bought a CD yesterday.
我昨天买了一张CD。
一种巨型椭圆星系
a type of giant elliptical galaxy
一种柔软的蓝白色有延展性和可塑性的有毒二价金属元素；与锌矿共生
a soft bluish-white ductile malleable toxic bivalent metallic element; occurs in association with zinc ores
国际单位制采用的基本光强单位；等于在2,046开尔文温度下每平方厘米黑体辐射的1/60光强
the basic unit of luminous intensity adopted under the Systeme International d'Unites; equal to 1/60 of the luminous intensity per square centimeter of a black body radiating at the temperature of 2,046 degrees Kelvin
银行发行的债务工具；通常支付利息
a debt instrument issued by a bank; usually pays interest
I bought a CD of my favorite band yesterday.
我昨天买了一张我最喜欢的乐队的CD。
This CD contains classical music from the 18th century.
这张CD包含了18世纪的古典音乐。
She put the CD into the player and pressed play.
她把CD放进播放器，按下了播放键。
CD是可数名词，可用不定冠词a修饰。
I bought a CD yesterday.
我昨天买了一张CD。
CD可置于另一名词前作定语。
I need a new CD case.
我需要一个新的CD盒。
表示以CD为介质或格式。
The album is available on CD.
这张专辑有CD版。
Choose the next layer that will help you use cd with more confidence.
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通常用作可数名词，如：a CD, two CDs。
该词属于 Oxford 核心词汇，值得优先掌握常见搭配和句型。
Collins 词频等级为 3，建议结合例句记忆，而不是只背中文释义。
Dictionary facts from ECDICT, WIKTIONARY.