Mangelinvar
鈷鐵鎳錳合金
??? 情景例句
That sounds very nice. When will it be?
聽起來真不錯，什么時候呢？
For once, I haven't taken the wrong train!
我從來不曾誤搭過一次列車。
Custom has not commonly been regarded as a subject of any great moment.
風俗一般未被認為是什么重要的課題。