这些公示语采取有效的言语手段，即通过一个系列的施为动词表达警告、劝诱、

These public signs take effective verbal means, that is, through a series of action verbs to express the meanings of warning, persuasion, instruction and persuasion, and prompt others to take corresponding extra-verbal behaviors to improve or maintain the environment.

These public signs adopt effective verbal means, that is, through a series of cast verbs to express the meaning of warning, persuasion, instructions and persuasion, to encourage others to take appropriate acts of speech, thereby improving or maintaining the environment.

These public signs adopt effective speech means, that is, through a series of action verbs to express the meaning of warning, persuasion, instruction and persuasion, to urge others to take corresponding extra speech behavior, so as to improve or maintain the environment.<br>