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

1. He stumbled and struck me on the back.
   他绊了一下，撞在了我背上。