working surface的用法和样例：
例句
- The difficulties of mining in working faces are directly decided by support patterns in gateways.
回采巷道所选用的护巷方式及支护形式直接决定了回采工作面开采的难易。 - Its range had the larger outstand to outboard working face under the condition of injecting grouts in separate layers.
离层带注浆时的覆岩破坏形态和范围向工作面外侧突出较大。
