他的口音难以识别。

He had an unidentifiable accent.

《牛津词典》

它们变得更难以识别，更容易被所有观众接受。

They become less identifiable, more generalizable to any audience.

youdao

因此，难以识别产品的商业价值。

As a result, it is difficult to identify the business value of the product.

youdao

One reason it's been harder to identify stem cells is that they're so rare; the other reason is that it's hard to identify the characteristics of them and it's taken many years to work this out.

干细胞难以识别的原因之一是,这些细胞很少,另一个原因就是,干细胞的特征性蛋白难以识别,我们花了好多年去解决这个问题

耶鲁公开课 - 生物医学工程探索课程节选