Nondirectional
[电] 无向性
🗣️ 情景例句
What's the book about?
这些书写什么？
One never loses anything by politeness.
有礼貌对自己不会吃亏。
When he returned to India he spoke in public about the situation in South Africa.
当他加到印度之后，他还就南非的形势公开发表演说。