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a lancer
lancer 是可数名词，指旧时持长矛的骑兵；单数前用不定冠词 a。
A lancer rode at the head of the column.
一名长矛骑兵骑行在纵队前头。
长矛骑兵
先理解核心含义，再看它在真实句子里的用法。
长矛骑兵
lancer
A lancer rode at the head of the column.
一名长矛骑兵骑行在纵队前头。
装备长矛武器的骑兵。
A cavalry soldier armed with a lance weapon.
多种亚洲弄蝶科蝴蝶中的一种,属 Plastingia 属。
Any of various Asian hesperiid butterflies of the genus Plastingia.
用矛刺或切开某物的人。
One who lances something.
The lancer raised his lance and charged toward the enemy.
那名长矛骑兵举起长矛，向敌人冲锋。
Two lancers guarded the entrance to the camp.
两名长矛骑兵守卫着营地的入口。
In the parade, each lancer wore a bright uniform.
在游行中，每名长矛骑兵都穿着鲜艳的制服。
lancer 是可数名词，指旧时持长矛的骑兵；单数前用不定冠词 a。
A lancer rode at the head of the column.
一名长矛骑兵骑行在纵队前头。
复数形式直接在词尾加 -s；表示一类人时通常不带冠词。
Lancers fought with lances.
长矛骑兵用长矛作战。
the lancers（兰谢舞）是一种老式方块舞，需用复数形式并加定冠词。
They danced the lancers at the ball.
他们在舞会上跳了兰谢舞。
Not this
There are many lancer in the army.
Use this
There are many lancers in the army.
lancer 是可数名词，复数形式为 lancers。汉语名词没有复数变化，学习者容易漏掉词尾 -s，因此 many 后要用复数 lancers。
Not this
He was lancer in the cavalry.
Use this
He was a lancer in the cavalry.
lancer 是单数可数名词，前面需要不定冠词 a 表示“一名”。汉语没有冠词，所以容易直接省略，导致句子不符合英语语法。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
骑马的枪骑兵
A mounted lancer raised his lance as the order came.
命令下达时，一名骑马的枪骑兵举起了长矛。
枪骑兵团
The lancer regiment was stationed near the border.
这个枪骑兵团驻扎在边境附近。
枪骑兵冲锋
The lancer charge caught the enemy by surprise.
枪骑兵的冲锋打得敌人措手不及。
一支枪骑兵中队
A squadron of lancers escorted the supply wagons.
一支枪骑兵中队护送补给马车。
枪骑兵军官
The lancer officer studied the map before the battle.
战前，那位枪骑兵军官研究了地图。
Use lancer naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
记住 lancer 里的 lance 是“长矛”，想象骑兵骑在马上持长矛冲锋，就是 lancer。
语域：formal 常见场景：historical narrative、military history texts、period fiction lancer 通常用于历史或军事类书面表达，属于正式用词，多出现在叙述或文献中。
指“兰谢舞”这种舞蹈时通常只用复数形式 lancers。
Dictionary facts from ECDICT, WIKTIONARY.