sharpened
['ʃɑ:pənd]
v.
（使）提高( sharpen的过去式和过去分词 );
（使声音）变得尖锐;
（使）变得更好（或技术更高、更有效等）;
（使）变得锋利;
例句:
-
Do I hear the sound of knives being sharpened?
来自SA
-
The case of Harris has sharpened the debate over capital punishment.
哈里斯案激化了人们对死刑的争论。
-
With urbanisation the antagonism between rich and poor sharpened.
伴随着城市化的推进，贫富间的对立情绪也加剧了。
-
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。
-
Virtually overnight, the tone of the page sharpened.
来自NEWYORKER
-
But this year, I've not sharpened even one.
来自VOA