She called down something about coal dust and sawdust, someone called back up to her, and she laughed.
她朝楼下说了一句煤灰和锯屑的话,有个人回了她一句,她发出笑声。
3
They work with remote control devices that change the direction, position and speed of a German-made cutting machine that slices back and forth along a 300-metre-wide coal face.