Lu Hefa (2005) defines public signs as "open and facing the public, with signs, instructions, prompts, displays, warnings, signs, and textual and graphical information related to their lives, production, life, ecology, and life.
Lu Hefa (2005) defines the public notice as "open and face the public, notices, instructions, prompts, displays, warnings, markings and text and graphic information related to their lives, production, life, ecology, livelihood, life and life
LV Hefa (2005) defined public signs as "open and facing the public, notice, instruction, prompt, display, warning, mark the text and graphic information closely related to their life, production, life, ecology and business."<br>