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 space退位,退格,返回back stamp底款backfillern.回填机(复土机)backstairsadj.秘密的；不正当的n.后面楼梯；密谋手段back steam回汽backsheeshn.酒钱；小费back brace后撑back drive反向传动, 反向驱动backbiasedadj.反馈偏压的(反向偏置的)back surge逆哩