What's the meaning of `a grain of salt'

antigloss

"There are only two kinds of languages: the ones people complain about and the ones nobody uses". Yes. Again, I very much doubt that the sentiment is original. Of course, all "there are only two" quotes have to be taken with a grain of salt.

And would you please tell me the meaning of the last sentence. Thanks in advance.

雪の国

是不是不全信的意思呢

雪の国

联系全文的话是不是可以理解成"行情必须有保留地被采取"呀?

antigloss

谢谢~

jajiuma

(With) a grain of salt is a literal translation of a Latin phrase, (cum) grano salis.
A pinch of salt may also be used.

In common parlance, if something is to be taken with a grain of salt,
it means that a measure of healthy skepticism should be applied regarding a claim;
that it should not be blindly accepted and believed without any doubt or reservation.
According to the Oxford English Dictionary "to take 'it' with a grain of salt" means
"to accept a thing less than fully". It dates this usage back to 1647.

Speakers may emphasize the degree of skepticism suggested by modifying the expression,
such as, "Take that with a BIG grain of salt!"
While the basic expression is commonly used to suggest that positive doubt exists,
thus modified it can be seen as a direct assertion that a claim is very doubtful, or outright false.

"to accept a thing less than fully".