Matroid
矩阵胚, 拟阵
🗣️ 情景例句
You don't sound very enthusiastic.
你似乎不太热衷。
Cry up wine and sell vinegar.
挂羊头，卖狗肉。
These friendly dogs, which were first brought from Asia, were used as watchdogs even in Roman times.
那些最先从亚洲引进的狗，待人友好，早在罗马时代就给人当看门狗了。