Often, a package has so many files it can be difficult to sift through the list to find the one (s) you're looking for.

很多时候，一个包包含了太多的文件，通过清单来查找所需项变得如此困难。

youdao

So it is difficult to argue that the TD-S project has helped make Chinese firms more internationally competitive.

所以，要说TD-S项目为中国企业提高国际竞争力而做出了贡献，很难说得过去。

youdao

So we can even define more clearly which is the stimulus or the stressor that trigger [s] the disease, whereas with other psychiatric diseases it is way more difficult.

所以就可以更明确地确定这种病的刺激原因，而其他心理疾病就很难找到原因了。

youdao

"I was one of these teenagers, and so I know how difficult it can be to break this habit when it's been with you for a long time,".

VOA: standard.2009.06.22

It's the vocabulary, it's the complexity of the thought, and so on that makes it difficult. Iser acknowledges this.

是词汇，思想的复杂性等等,使它变得难懂，伊瑟尔承认这一点。

耶鲁公开课 - 文学理论导论课程节选

it's very difficult when one is so articulate and is able to express exactly what you want to say,

当一个人已经熟谙一门语言，能够用这门语言清楚明白地表达意思，

想学好英语吗？ - SpeakingMax英语口语达人

The U.S. has traditionally refrained from imposing duties on supposedly subsidized imports from nonmarket economies because it's so difficult to break out what the actual subsidies are for each company and industry.

FORBES: Magazine Article

"It's so difficult to quantify, " said Alejandro Moreno, a former MLS Cup winner with Columbus and now a soccer analyst.

WSJ: Is Thierry Henry Worth the Money?

"It's so difficult to take other factors into account - for example, moderate drinkers might have a better social environment, " he told BBC News Online.

BBC: Alcohol 'improves IQ'