Does the public sign mean "Keep Quiet"?
【公益慈善翻译团】真诚为您解答!mean不用加s的吗前面有助动词does,就不用了。直接说肯定句，The public sign means "Keep Quiet!",是要加s的。再举个例子： 他喜欢弹吉他吗？“Does he like playing the guitar?”