Many of the best ideas come from doctors at the coalface.

许多最好的主意都来自临床医师。

《牛津词典》

At the small Bandingliang colliery, the pit has been dug so far into the hillside that truck drivers take 30 minutes to reach the coalface, fill up and return with their load.

在板定梁煤矿，矿井已被挖进山体深处，卡车司机开了30分钟才到达采煤工作面，装上煤之后满载而归。

youdao

"For her to criticise without actually being at the coalface is certainly not helpful".

BBC: Dame Kiri remarks strike sour note

But for organisations at the coalface of delivering energy efficient homes, the policy change involves a real financial worry.

BBC: Rising fuel bills: Concern over govt 'Green Deal'

At the very least, work with organizations already at the coalface day after day, collaborate with and listen to them.

CNN: Sexualized Femen protest 'naive and foolish at best'