Casehardened
a. 經熱處理變硬的, 無感覺的, 麻木不仁的
??? 情景例句
This method should be widely promoted.
這種方法應該推廣。
Don't you think we should add a sentence here like this?
難道你不覺得我們應該在這兒加上一句話？
Everyone knows that if he shouts in the vicinity of a wall or a mountainside, an echo will come back.
大家都知道，在墻壁或山腰附近發出的喊聲，就會聽到回聲。