But these days you pay for it which is why you get SSDs, you're paying several hundred dollars more.

但是现在你购买固态硬盘，需要多花费几百美元。

哈佛公开课 - 计算机科学课程节选

Stuff that the eighteenth century farmer made for him and herself now you bought from a peddler or you bought from a store in town.

8世纪的农民,自给自足的东西,现在他们从商贩那儿购买,或者到城里的商店购买

耶鲁公开课 - 美国内战与重建课程节选