Orthonormal
[计] 规范正交的
🗣️ 情景例句
my sister and her husband and their daughter.
我妹妹Susan和她丈夫以及他们的女儿。
They called us just as we were having dinner.
当我们正在吃晚饭，他们就打电话给了我们。
He wrote books about communism. He said that all communists should help each other.
他写了不少关于共产主义的著作。他说所有的共产党人都应该互相帮助。