Moonlighter is a person who holds a second job (usually after hours).

“月光人”指的是拥有第二职业的人（通常在下班后去做）。

According to the US Department of Labor, about 7 to 8 million of us -- about 5+ percent of all workers -- work multiple jobs (which is often referred to as moonlighting and dual or multiple jobholding).

根据美国劳工部的数据，大约700万到800万美国人（约占所有员工人数的5%）从事多种职业（通常被称为从事第二职业，或者有两份或三份工作）。