it is said，据说。it says，它说。It says sth，这很能说明问题。It says that，是指某个文书或故事或规定如此说。
It says in: 在...上写道，在...上说
It says on: 在...上写道，在...上说
It is said 据说，后接从句，或者用It has been said也是同样的意思，但语气更强烈
It is said that she lived to be over 100.
It is said that the plant can be used to treat hepatitis.
It is said that this medicine can alleviate pain.
It is said seaweed is edible.
It says on the label ‘ Produce of France ’.
It says a lot for him that he has raised his game to the level required
Don't stick too precisely to what it says in the book.
It says the photograph is likely cause distress and offence to the public
It says torture and summary execution are common