Backas巴卡斯backn.后面；背脊；靠背；后背；后卫vt.支持；后退adv.向后地adj.向后的；后面的；偏远的；过时的；积欠的back loader反铲装载机backslapper过分友好者back splint背夹back course反航线(角)backfielder后卫back pocket后衣袋back weight平衡锤back-pourn.补浇back-workn.工作面和井筒之间的工作；井下工作面以外的工作；辅助工作back source[电] 后备电源

1. Several big publishers have declared to move their entire backlist of books into the digital sphere.
   几家大型出版商声明他们将把自己的书籍搬到数字领域。