英语语法分析

Although the "ne" in negatives should always be written, it is very rarely used in informal speech.

尽管“ne”在否定式中应总被书写，在非正式口语中却很少被用到。

For those of you who have never heard French before, when you hear somebody say, "Je ne sais pas," you could say, "Remarkable!"

对于你们那些从未听过法语的人来说，当你们听到有人说“Je ne sais pas”，你可能会说：“太神奇了！”

He has that je ne sais quoi that distinguishes a professional from an amateur.

他有那种难以言表的特质，体现出他是专业而非业余的。

《牛津词典》