hone

他每周都会磨剪刀，保持刀刃锋利。

He ___hones his scissors every week to keep the blades sharp.

她不断练习以磨练自己的演讲技巧。

She keeps practicing to ___hone her public speaking skills.

那位厨师每天早上都在烹饪学校学习磨炼刀工。

The chef spent mornings learning to ___hone her knife skills at the culinary school.