“掌子”怎么读？

公用之马,掌子最差.The common horse is worst shod.塞尼山隧道是从两头的掌子面同时掘进的.一头在法国,一头在意大利,最后在中间汇合.The Mont Cenis was bored from two different headings, one in France and one in Italy....

“掌子”的英语可以翻译为：[矿] face，work area ...