倒车及停航试验back: n. 1.背,背部;背脊;背面,反面;背后,后部,后面, ...trial: adj. =trinal. back sto ing: 上向梯段回采sto ing: 停球no sto ing at any time: 任何时间不准停车下载手机词典可随时随地查词查翻译