优质解答
定义：
A safety symbol indicates the presence of information or instructions about health or safety at work by means of a signboard,a colour,an illuminated sign or acoustic signal,a hand signal or a verbal communication.
自己翻译吧
定义：
A safety symbol indicates the presence of information or instructions about health or safety at work by means of a signboard,a colour,an illuminated sign or acoustic signal,a hand signal or a verbal communication.
自己翻译吧