It is difficult to make a comparison with her previous book—they are completely different.

这很难与她以前的书相比—两者是截然不同的。

《牛津词典》

Direct comparison with exercise is difficult, but Berk estimates the physiological benefits were equivalent to those of a moderate 20-minute workout.

将它直接与锻炼相比较是困难的，但是伯克估计生理益处是等效的适度的20分钟的锻炼。

youdao

It's more difficult to make an unfavourable comparison when there is nothing directly comparable.

当没有直接的可比较的东西时，做出不利比较就困难得多了。

youdao

The first quarter of 2011 is up against an incredibly difficult comparison to Q1 2010.

FORBES: Box Office is Down 20%. Should Hollywood Panic?

Firstly, it faces a difficult comparison since the sales in the first three months of 2012 were unusually high.

FORBES: Weaker Sales Could Eat McDonald's Lunch In Earnings

The company has a difficult comparison with last year when there were many clearance sale events as goods bought under the previous management were sold off.

FORBES: J.C.Penney's Comeback Is A Farce So Far, And It Could Get Worse