work on something: to spend time producing or improving something “从事，致力于” e.g. His grandmother pays extra so he can work on his pronunciation with foreigners. 他的祖母另外付钱让他和外国人练习提高发音水 平。work on something: to spend time producing or improving something “从事，致力于” e.g. His grandmother pays extra so he can work on his pronunciation with foreigners. 他的祖母另外付钱让他和外国人练习提高发音水 平