suf. sb who does sth or is doing sth

suf. 名词后缀，与-er同义，意为“干某工作的人；正在做某事的人”，如：actor（演员）; competitor（竞争者）; director（导演）; editor（编辑）; translator（译员）; visitor（参观者）。

其他例词

ancestor; author; bachelor; conductor; doctor; emperor; inventor; monitor; operator; professor; sailor; sponsor; tailor; tutor