单词business envelope
网络: 商业信封；求购商业信封；求购商业用信封
Resume and letter are mailed flat in a business envelope (first choice) or neatly folded into thirds with the resume on top of the letter.
简历和求职信平放（无折叠）在一个商业信封里（第一选择）或整齐的折叠起三分之二放在信封里。
She removed the tape from the business envelope and opened it, shaking.
她拿掉公函上的带子，拆开信封，手在颤抖。