plug away
phrasal verbplug away (at something)
- to continue working hard at something, especially something that you find difficult
坚持不懈地做（尤指困难的事） - We kept plugging away at the school until they agreed to our demands.
我们一直在学校埋头苦干，直到他们同意我们的要求。
- We kept plugging away at the school until they agreed to our demands.