It is difficult to measure the success of the campaign at this stage.

在现阶段还难以估量这场运动的成败。

《牛津词典》

This is difficult to measure.

究竟高出多少很难衡量。

youdao

Success rates are difficult to measure.

成功率是很难衡量的。

youdao

Success rates are difficult to measure.

VOA: special.2010.04.13

I don't want to have to deal with heat escaping to the outside environment in a way that might be difficult or complicated to measure or calculate.

我可不想处理跑到,环境中去的热量，那测量或,计算起来会非常麻烦和复杂。

麻省理工公开课 - 热力学与动力学课程节选

It also is a good lesson in how difficult it is, and we'll talk about this in a subsequent class, to actually measure what people eat.

同样这能很好的说明,实际评价人们的饮食有多困难,我们下节课会讨论这个话题

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

Yet each year it becomes more difficult to measure Christmas in anything other than retail sales.

BBC: An eye on simplicity

It is difficult to measure from the Street how consumers are actually dealing with higher costs, however.

FORBES: Analyst: Nation's Poor Saw Twice The CPI Rise Last Month

These concepts may be elusive and difficult to measure, but their significance is far greater than IQ.

FORBES: Intelligence Is Overrated: What You Really Need To Succeed