To work very hard or to be extremely hardworking.

工作努力或努力到极致。

youdao

Thee hardworking blacksmith Jones used to work all day in his shop and so hard working was he that at times he would make the sparks fly from his hammer.

琼斯是个非常勤劳的铁匠，常常一整天都在店里工作。他工作非常努力，他的铁锤下常常是火花飞舞。

youdao

The hardworking blacksmith Jones used to work all day in his shop and so hard working was he that at times he would make the sparks fly from his hammer.

琼斯是个非常勤劳的铁匠，常常一整天都在店里工作。他工作非常努力，他的铁锤下常常是火花飞舞。

youdao

Since when are hardworking men and women who are putting in a hard day's work every day -- since when are they special interests?

WHITEHOUSE: President Obama Speaks on the Resurgence of the American Auto Industry | The White House