work as a janitor
work as 后接职业名词，表示“从事……工作”；janitor 前通常用 a。
He works as a janitor at a nearby school.
他在附近一所学校做清洁工。
清洁工；保洁员
门卫；看门人；看门人。；守卫；门警
a person employed to clean and maintain a building
看门人。
A doorman.
清洁工
someone employed to clean and maintain a building
The janitor cleans the classrooms every evening.
管理员每天晚上打扫教室。
用法提示：句中“janitor”指负责清洁的学校管理员。
The janitor is responsible for maintaining the HVAC system.
管理员负责维护暖通空调系统。
用法提示：句中“janitor”指承担维护职责的建筑物管理员。
Please call the janitor to fix the leaking faucet.
请叫管理员来修理漏水的水龙头。
用法提示：句中“janitor”指执行修理任务的管理员。
work as 后接职业名词，表示“从事……工作”；janitor 前通常用 a。
He works as a janitor at a nearby school.
他在附近一所学校做清洁工。
说明在某机构工作时常用 at；表示身份时 janitor 前用 a。
She is a janitor at the city hospital.
她是市医院的清洁工。
所有格 janitor's 可表示“清洁工使用的”；注意撇号写在 s 前。
The mop is in the janitor's closet.
拖把在清洁工的储物间里。
one of the + 复数名词 表示“……之一”，谓语动词通常用单数。
One of the janitors reported a broken light.
其中一名清洁工报告了一盏灯坏了。
grammar · medium
易错句子She is janitor at the office.
正确表达She is a janitor at the office.
英语中单数可数名词作表语时通常要加不定冠词 a/an；janitor 是可数名词，不能像汉语“她是清洁工”那样省略冠词。
grammar · medium
易错句子The company hired three janitor.
正确表达The company hired three janitors.
英语可数名词在数词 three 后必须用复数形式；janitor 的复数是 janitors，汉语名词本身不变化，容易漏加 -s。
grammar · medium
易错句子Janitor is a hard job.
正确表达Being a janitor is a hard job.
janitor 指人，不指工作本身；表示“做清洁工这份工作”时，要用 Being a janitor 或 Janitorial work，不能直接用职业名词作主语指工作。
cleaner 泛指做清洁的人，英式常指上门清洁工或干洗店店员；janitor 多指美式用语中受雇维护整栋楼（含清洁、小修）的人，职责范围更广。
custodian 侧重受雇照管房产、学校等设施的人，正式且可含保洁与维护；janitor 更口语、更常指校舍或楼宇的清洁杂工，两者在美式学校里可换用，但 custodian 也可指法律上的监护人。
doorman 只负责门口迎送、看门，不含清洁；janitor 的“看门人”义项在美式里较少，且通常兼做楼宇维护，若只强调守门应用 doorman。
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