The Great Migration could easily have been made up entirely of this group and their families.

made up这里怎么理解?!

It is perhaps surprising to argue that an employed population could be enticed to move, but an explanation lies in the labor conditions then prevalent in the South.

这句话看得人云里雾里!

The Great Migration could easily have been made up entirely of this group and their families.

made up这里怎么理解?!

make up of是一个固定词组，组成，构成的意思。

The great Migration 可能完全是由这一群人及他们的家人组成的。

It is perhaps surprising to argue that an employed population could be enticed to move, but an explanation lies in the labor conditions then prevalent in the South.

这句话看得人云里雾里!

有工作的人可能受到吸引而迁移这种说法可能令人吃惊，但是解释在于当时在南部盛行的劳动环境。