backsaw短锯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-panel Ethernet port后面板以太网端口backwall photovoltaic cell后壁阻挡层光电池back-explored technology回采工艺backstrengthening exercise背部增力操练Back-side metal adhesion背面金属粘附back propagation algorithmBP算法Back to main results index返回成绩首页back-of-the-envelopeadj.能快速容易地确定的；不需要复杂计算的Back to the astronomy cafe重返天文咖啡馆Back - propagate network反向传播网络