no sign =not a sign

no sign =not a sign sign A is not some sign of B, 1."There was not a single trail,no sign of civilization,and no sign of 下面这段话中sign a deep sign sign=（-1）*sign是什么意思.为什么要再*sign he saw a sign (saying 还是 said)"no smoking". There's a sign "No Smoking".Sorry,I ___ it. sign a contract是什么意思 A sign of breathe a sign of