Matroid
矩阵胚, 拟阵
🗣️ 情景例句
Cooking dinner for the entire family is not so easy.
给全家人做晚餐真不是件容易的事。
It is the first step that costs.
万事开头难。
I know that one of the towers is on the top of a hill, but the rest of the buildings are easy to get to.
我知道其中有个塔在山上，但其余的建筑物都并不难上。