v.(使)变硬( harden的第三人称单数 );(使)坚固;(使)硬化;(使)变得坚强;
例句:
Brain part blood supply is insufficient, the blood vessel of brain hardens!
脑部供血不足, 脑血管硬化!
The officer's voice hardens.
军官的口气更生硬了.
The food hardens as it cools.
食物冷却时变硬.