be a reservist
reservist 是可数名词，复数形式为 reservists。
He is a reservist in the army.
他是军队中的一名预备役军人。
预备役军人
被编入预备役的士兵:训练后不再服全职现役。；后备军人
a member of a military reserve
被编入预备役的士兵:训练后不再服全职现役。
A soldier who is assigned as reserved: after training, no longer on full active duty.
Every summer, my uncle attends training as a reservist.
每年夏天，我叔叔都以预备役军人的身份参加训练。
用法提示：reservist 为可数名词单数，表示“预备役军人”，在句中作介词 as 的宾语。
The government called up hundreds of reservists to help with the flood relief.
政府征召了数百名预备役军人协助洪水救援工作。
用法提示：reservists 是名词复数形式，指多名预备役军人，在句中作动词短语 called up 的宾语。
After leaving the army, she became a reservist and continues to train one weekend a month.
退伍后，她成为一名预备役军人，并继续每月训练一个周末。
用法提示：reservist 为单数名词，在此作表语，说明身份。
reservist 是可数名词，复数形式为 reservists。
He is a reservist in the army.
他是军队中的一名预备役军人。
He served as a reservist for two years.
他当了两年预备役军人。
reserve 作可数名词时可指一名后备役军人，但复数 the reserves 常指后备役部队整体。与 reservist 相比，reserve 在表示单个人时较少见且不够明确，正式语境中多用 reservist。
grammar · medium
易错句子He is reservist.
正确表达He is a reservist.
reservist 是可数名词单数，前面需要加冠词 a；中文没有冠词概念，容易遗漏。
grammar · medium
易错句子All reservist must report for duty.
正确表达All reservists must report for duty.
泛指所有预备役军人时，reservist 要用复数形式 reservists；中文名词没有复数变化，容易忽略词尾 -s。
grammar · medium
易错句子He is a member of the reservist forces.
正确表达He is a member of the reserve forces.
reservist 是名词“预备役军人”，不能作定语修饰 forces；表示“预备役部队”应用名词 reserve 作定语，即 reserve forces。
此处指与“预备役军人”（reservist）相对的正规军成员，即常备兵员或现役军人。
reserve 作名词指「后备部队」这类集体概念，而 reservist 指其中的一名「预备役军人」个人；用词时要区分整体与个人。
conscript 指刚被征召入伍、开始服役的人，reservist 指已完成训练并作为后备力量的预备役军人，二者身份阶段不同。
reserved 是形容词，意为「沉默寡言的」或「已被预订的」，与 reservist 词形相近，但词性和意义都不同，不能混用。
征召预备役军人
The government decided to call up reservists to support the peacetime mission.
政府决定征召预备役军人以支援和平时期的任务。
军事预备役人员
As a military reservist, she attends monthly drills.
作为军事预备役人员，她每月参加训练。
部署预备役军人
The army deployed reservists to assist with flood relief.
军队部署预备役军人协助抗洪救灾。
以预备役军人身份服役
He served as a reservist for several years before retiring.
他在退役前以预备役军人身份服役多年。
预备役训练
All reservists must complete annual reservist training.
所有预备役军人必须完成年度预备役训练。
re- (back) + serv(e) (keep/save) + -ist (person); related: reserve (v. 保留), reservation (n. 预订/保留), serve (v. 服务), servant (n. 仆人), conservationist (n. 环境保护主义者)
指将预备役人员转为现役的军事行动，与reservist的征召使用直接相关。
指正式命令预备役人员报到服役，常与reservist搭配出现。
预备役军人定期参加的军事训练，是reservist的日常活动。
将预备役部队调派至任务区域，涉及reservist的实际运用。
预备役人员集结或训练时居住的军事设施，与reservist的环境相关。
Dictionary facts from ECDICT, WIKTIONARY.