Bidimensionality
n. 二維性
??? 情景例句
What is it?
怎么回事
In vain.
白忙一場。
Now that they could ride horses, it became easier to hunt the bison, a type of cattle which used to exist in huge numbers on the plains of America.
當他們從一個營地搬到另一個營地去的時候，他們就可以利用這些野馬來運載貨物。既然土著人會騎馬了，獵取野牛也就容易了。這種野牛以前是成群結隊地生活在美洲平原上的。