Jackleg Drill

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Percussive tool that is powered by compressed air; it is used to bore holes into hard rock. The air leg makes the job easier for the drill operator.

percussive = producing a sharp, powerful sound, typically by hitting or striking something

bore = make (a hole) in something with a tool or by digging

humidity = here water

wear = here damage caused to something caused by using it a lot

EFL subset that concentrates more on language in context than on grammar and language structures. It covers topics from accounting or computer science to tourism and business management. "Specific" means the studying through a field that is already known and relevant to a student.