为什么The sign does not mean No littering不能用is not

为什么The sign does not mean No littering不能用is not what does the sign what does the sign mean. Does the sign on the cage interesting? What does the sign mean in English? what does the sign mean咋回答 Does the word sign that good? I can not believe the sign of What does the sign on the wall means?改错 Does the sign on the cage interesting?(改错） what does this sign mean on the wall?为什么on the wall在前面,而mean在后面?急不好意思，打错了。是what does this sign on the wall mean？ the knod does not The future does not what does the sign over there read?.what does the sign over there read?No person________smoke or carry a lighted cigartte,cigar or pipe in this area.A will B may C shall D must选什么,为什么? What does the sign meas?It means No t____ Could someone tell me what does this sign mean in mathematics?The sign ^. What does this sign mean?可以写成 what is this sign mean?为什么? Error:Specified license does not have a SIGN= field -or- the specified licequartus运行程序出的问题,我的licence应该改好了啊