I have no idea what they're going to say, so I'll have to play it by ear.
我一点不知道他们将会说些什么,所以我只好见机行事。
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.
当他们从一个营地搬到另一个营地去的时候,他们就可以利用这些野马来运载货物。既然土著人会骑马了,猎取野牛也就容易了。这种野牛以前是成群结队地生活在美洲平原上的。