矿工们在采煤工作面辛苦劳作。

Miners work hard at the ___coalface extracting coal.

作为一名教师，他更喜欢在教学一线与学生互动，而不是坐在办公室写报告。

As a teacher, he prefers to be at the ___coalface interacting with students rather than writing reports in the office.