Matroid
矩阵胚, 拟阵
🗣️ 情景例句
Are you sending it by regular or by speed?
你要寄平信还是快递？
Two or three of them look familiar.
我认识他们中的两三个。
Then I made faces and jumped like a monkey. The baby laughed and laughted.
然后我做鬼脸，像猴子一样跳来跳去。那孩子笑个不停。