同时兼两个职业的人

[ noun ]
a person who holds a second job (usually after hours)
<noun.person>

Moonlighter \Moon"light`er\ (m[=oo]n"l[imac]t`[~e]r), n.
One who follows an occupation or pastime by moonlight; as:
(a) A moonshiner.
(b) In Ireland, one of a band that engaged in agrarian
outrages by night.
(c) A serenader by moonlight. [Local, U. S.]
(d) One who works at a second job in addition to his main
occupation.
[Webster 1913 Suppl.]