Unfortunately, cancerous cells look a lot like healthy cells, making it hard for those T-cells to spot a problem.

不幸的是，癌性的细胞和健康细胞外表看起来实在太相像了，让那些T细胞很难发现其中(癌性细胞)有问题。

youdao

But it isn t hard to think of school subjects that provide less return-economically, anyway-than a foreign language.

但是，很难想到学校里哪个学科比英语经济回报更低。

youdao

youdao

"It didn't seem to be that hard of a decision. I like to give to others.

VOA: standard.2010.03.11

But that's a little bit hard, we aren't all that good at seeing electrons with our eyes, so we need to think of a way to do this.

但那有一点困难，我们都不能通过眼睛看到电子，我们需要想一种方法去做到它。

麻省理工公开课 - 化学原理课程节选

I have made lots of friends from other parts but yeah, so initially like, it wasn't hard

我还认识了好多别处的朋友，所以，一开始不困难，

留学生的适应期 - SpeakingMax英语口语达人

But there wasn't hard evidence in humans to support the claim, study authors said.

WSJ: Sunscreen Each Day Stops Wrinkles

Although most people aren't hard to please, some (early adopters) demand high picture quality.

ENGADGET: MovieBeam: who wants it? HD

Ten years ago it wasn't hard to find skeptics about the democratic experiment in Indonesia.

WSJ: Indonesia Is a Model Muslim Democracy