判断真假英文

It's hard to tell. tell是辨别的意思

I bought a box of your products, and want to inspect it for its authenticity

W上购物很难辨别真假的英文翻译OnlineshoppingisdifficulttodistinguishbetweentrueandfalseW上购物很难辨别真假的英文翻译Onlineshoppingisdifficulttodistinguishbetweentrueandfalse

It is difficult to tell whether this (LV bag) is authentic or fake. -------from a New York Times articleit's extremely difficult to tell the real from the counterfeit. -------from a Business Week article

I bought a box of your product, I would like to test the genuineness of goods

It's hard to say whether it's true or false.