A cardboard used by bookbinders to make covers for books .
装订工用来做书的封面的纸板。
Singer also received national recognition for the contract design and tabletop installation at old original bookbinders in philadelphia .
歌手也在费城在旧原来的装订商为合同设计和桌面安装收到了国家识别。
Among so-called blue-collar jobs , firefighter , police officer and taxi driver topped the high-stress list , while jobs such as bookbinders , photo process workers , musical instrument repairers and auto assemblers are considered low-stress .
