Triality
三隅对称性
🗣️ 情景例句
What's wrong with wanting to be on the school board?
想进入联合校董会有什么错？
She failed to call the office to cancel her appointment.
她没能打电话给办公室取消她的约会。
I make them for workers and farmers.
我做完了给工人和农民用？