Monotrailer
单轴挂车
🗣️ 情景例句
Dad often works late,
爸爸老是工作到很晚，
I tried to call you, but the line was busy.
我试着给你打电话，但老占线。
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。