a ram
指公羊时为可数名词，单数前要加 a/an 或 the，复数形式是 rams。
There is a ram in the field with the ewes.
田里有一只公羊和母羊待在一起。
随机存取存储器；内存；攻城槌；撞锤；液压活塞；撞击；猛撞；白羊座；白羊座出生的人
公羊,通常未阉割。
A male sheep, typically uncastrated.
美国在朝鲜战争中的反坦克武器
A US Korean War anti-tank weapon.
随机存取存储器,计算机通电时程序用于执行任务的最常见内存,可随机读写
the most common computer memory which can be used by programs to perform necessary tasks while the computer is on; an integrated circuit memory chip allows information to be stored or accessed in any order and all storage locations are equally accessible
攻城槌；用于撞破门的重物。
A battering ram; a heavy object used for breaking through doors.
太阳位于白羊座时出生的人
(astrology) a person who is born while the sun is in Aries
由液压驱动的活塞。
A piston powered by hydraulic pressure.
黄道十二宫第一宫,太阳在春分时进入,约3月21日至4月19日
the first sign of the zodiac which the sun enters at the vernal equinox; the sun is in this sign from about March 21 to April 19
撞击行为。
An act of ramming.
在打桩机、蒸汽锤或冲压机中用于撞击的重物。
A weight which strikes a blow, in a ramming device such as a pile driver, steam hammer, or stamp mill.
The farmer keeps a ram with the ewes during the breeding season.
农场主在繁殖季节把一只公羊和母羊养在一起。
用法提示：这里的'ram'是名词，意为'公羊'。
Rams often fight with each other using their horns.
公羊经常用角互相打斗。
用法提示：'rams'是'ram'的复数形式，指多只公羊。
The ram stood still at the top of the hill, watching the valley below.
那只公羊一动不动地站在山顶，望着下面的山谷。
用法提示：'the ram'特指某只公羊，在句中作主语。
指公羊时为可数名词，单数前要加 a/an 或 the，复数形式是 rams。
There is a ram in the field with the ewes.
田里有一只公羊和母羊待在一起。
battering ram 指攻城槌或破门用的重物，也是可数名词，前面同样需要用冠词。
The police used a battering ram to break down the door.
警察用破门锤撞开了门。
指计算机内存时 RAM 不可数，不加冠词，也没有复数形式，常与数量表达连用。
This laptop has 16 GB of RAM.
这台笔记本电脑有 16 GB 内存。
表示白羊座的人时首字母大写，用 a Ram 指某个白羊座的人。
My brother is a Ram, so his birthday falls in early April.
我哥哥属白羊座，所以他的生日在四月初。
grammar · medium
易错句子Ram is a male sheep with horns.
正确表达A ram is a male sheep with horns.
英语可数名词单数在泛指一类事物时，前面必须加不定冠词 a/an；汉语没有冠词这一词类，所以中国学习者最容易漏掉。ram 是可数名词，此处泛指"一只公羊"，应说 a ram。
grammar · medium
易错句子The farmer keeps twenty ram on his farm.
正确表达The farmer keeps twenty rams on his farm.
英语可数名词与大于一的数词（twenty）连用时，必须用复数形式 rams；汉语名词本身不随数量变化，只靠数词表示多少，因此学习者常忘记加 -s。ram 的复数是规则的 rams。
grammar · medium
易错句子The ram gave birth to two lambs in the spring.
正确表达The ewe gave birth to two lambs in the spring.
ram 特指"公羊"，属于雄性，不可能生育；汉语的"羊"不分公母，需要按语境选词，产羔的是母羊，英语用 ewe。因此表示"生下两只羊羔"时应把 ram 换成 ewe。
攻城槌；撞门槌
Police used a battering ram to break down the front door.
警方用撞门槌撞开了前门。
公羊的角
A ram's horns curve backwards over its head.
公羊的角在头顶向后弯曲。
种公羊
The farmer bought a stud ram to improve his flock.
农夫买了一头种公羊来改良羊群。
公羊和母羊
The flock consisted of one ram and twenty ewes.
这群羊由一头公羊和二十头母羊组成。
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