public signs有哪些

public signs有哪些 Public signs public signs怎么读 public signs英语作文 public signs 课文翻译 英语作文public signs what does these public signs mean有什么错 I know__about public signs ,原因 英译中（中译英）2public signs What does these public signs mean? public signs如何用英文定义呢? Look the public signs over there.这句话有错误吗?look后是可以直接接名词的吧