He worked much harder then.

那时他工作要努力得多。

I think that I'll have to study much harder for exams.

我认为我必须为考试更加努力学习。

Without a capo, this song is much harder to play.

没有变调夹，这首歌要难弹得多。

The math class in grade eight is much harder than in grade seven.

初二的数学课比初一的难多了。

The courses in senior high school are much harder than in junior high.

普高的课程比初中要难很多。

The textbooks in third grade are much harder than those in second grade.

三年级的课本比二年级的难多了。

The courses in junior high school are much harder than those in elementary school.

初中的课程比小学的难多了。

It is much harder, however, to understand their negative consequences.

然而，认识它们的负面后果要困难得多。

Not only are the tasks apparently infinite, the co-workers are much harder to motivate.

不仅工作显然是无穷无尽的，同事们也更难受到激励。

Since industrialization, maintaining such a slow cultural metabolism has been much harder.

自从工业化以来，保持缓慢的文化更迭变得更加困难。