Backen.巴克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 slums贫民窟backvelder偏僻乡村backthrust反冲构造backed bow加固弓back shunt矿车自动折返装置backspacern.退格键backscatte反散射back river后河back quota后配额Backstrandn.巴克斯特兰