A part-timer is a person who works part-time: only some hours of the day, or only some days of the week, not a full working week. The word names the person, not the job itself.

a part-timer是 a person who works part-time打工／兼職的人：only some hours of the day只在一天裡的部分時間工作，or only some days of the week或者一星期裡只工作幾天，not a full working week不是完整的一週工時。the word這個字 names the person, not the job itself指的是人，不是那份工作本身。

A shop might have three full-timers and two part-timers. Students, parents of young children, and people with a second job are often part-timers, but anyone can be.

a shop一間店 might have three full-timers and two part-timers可能有三個全職和兩個兼職。students, parents of young children, and people with a second job學生、有年幼小孩的家長，和有第二份工作的人 are often part-timers常常是兼職人員，but anyone can be不過任何人都可以是兼職。

It is everyday and slightly informal; in careful notices you may see ‘part-time worker’ or ‘part-time staff’ instead. It is not about a clock or a kitchen timer.

it is everyday and slightly informal這是日常、稍微口語的用法；in careful notices在正式一點的公告裡 you may see 'part-time worker' or 'part-time staff' instead可能會改用 'part-time worker' 或 'part-time staff'。it is not about a clock or a kitchen timer這個字跟時鐘或廚房計時器一點關係都沒有。

Opposite idea: a full-timer. Pay, holidays, and benefits are often less than for full-time staff, though that depends on the country and the contract — the word itself only talks about hours, not about whether the work is casual or serious.

opposite idea相反的說法是 a full-timer全職人員。pay, holidays, and benefits薪水、假期和福利 are often less than for full-time staff通常會比全職員工少，though that depends on the country and the contract不過這要看國家和合約而定——the word itself only talks about hours, not about whether the work is casual or serious這個字本身只是在講工時，不是在講這份工作是不是正經工作。