caseharden

中文含义：使（钢）表面硬化；（人、心思等）坚强起来

英语词性：verb

美式音标：[ˈkeɪsˌhɑrdn]

同义词：harden, strengthen, toughen

易混淆单词：carton, carotenoid, carcinogen

双语例句：

1. Properly heating metal can caseharden it and make it more resistant to wear and tear.
（适当加热金属可以使其表面硬化，使其更耐磨）

2. The hardships he experienced as a child helped caseharden him later in life.
（他在童年时期经历的艰辛帮助他在后来变得坚强起来）