There are both term-time and summer employment opportunities for students.

不管在学期内还是在暑假，学生都有工作的机会。

But summer employment for kids still in school may be effective, according to a study by criminologist Sara Heller at the Universityof Pennsylvania.

而宾夕法尼亚大学刑事学者萨拉? 海勒的一项研究显示在校青少年暑期打工或许能起到些作用。