V-ERG
(感觉、理解)加强;(使)加深;(技巧)提高;(使)改善
If your senses, understanding, or skills sharpen or are sharpened, you become better at noticing things, thinking, or doing something.
例句
Her gaze sharpened, as if she had seen something unusual...
她眼睛一亮，仿佛看见了什么不寻常的事情。
You can sharpen your skills with rehearsal.
排练可以让技巧更加纯熟。