1. 对…进行微调;细调
If you fine-tune something, you make very small and precise changes to it in order to make it as successful or effective as it possibly can be.

1. make fine adjustments or divide into marked intervals for optimal measuring

e.g. calibrate an instrument
graduate a cylinder

Synonym: calibrategraduate

2. adjust finely

e.g. fine-tune the engine

Synonym: tweak

3. improve or perfect by pruning or polishing

e.g. refine one's style of writing

Synonym: polishrefinedown