Ferromagnon
铁磁振子, 铁磁自旋波
🗣️ 情景例句
Are you the oldest in your family?
你是你家里最大的孩子吗？
Quite so.
的确是这样。
That was quick! she said. Have you finished already?
“你真快！”她说，“你已经买完东西了吗？”