What does the signs mean? 改错

What does the signs mean? 改错 What does the signs mean.这句话哪错了 What ___ the signs mean? What does these public signs mean? What do the signs mean?回答应该是? what does these public signs mean有什么错 what ______ the signs mean?______mean“Keep off the grass”. what does the word mean? what does the man mean What does the picture mean? what does the sign mean. mean the what do signs 怎么组成问句