working surface的用法和樣例：
例句
- The difficulties of mining in working faces are directly decided by support patterns in gateways.
回采巷道所選用的護巷方式及支護形式直接決定了回采工作面開(kāi)采的難易。 - Its range had the larger outstand to outboard working face under the condition of injecting grouts in separate layers.
離層帶注漿時(shí)的覆巖破壞形態(tài)和范圍向工作面外側突出較大。
