backemfn.反电动势
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 muddy phenomenon返浑现象
Back reflection light背面反射光
backwall of work well后背墙
back water suppressor回水减低设备
back-to-back loan[经] 对销贷款
back fill of platform台背回填
back supporting plate背支板
back-beaming method分批整经法
back fire check valve逆弧止回阀
back scattering image反向散射象