Subspecies are often difficult to distinguish from one another.

区分不同的亚种是很困难的。

Human beings are distinguish from animals but the ability to laugh.

笑的能力将人类和动物区分开来。

Human cases of H5N1 may be difficult to distinguish from other illnesses.

H5N1型人类病例很难与其他疾病相区别。

The second thing you must distinguish from an argument is a sentence.

第二种你们必须与,论点分开的是一句话。

It's really hard to distinguish from Slightly different of these meaning.

把这些词义的微差别区分开来确实是件很难办的事。