safety sign是什么意思

用法例句

The application of the self luminous fire safety sign product has been discussed in the paper as well.

文章介绍了一种新型的蓄光自发光型材料 ,分析了这种材料的特点 ,讨论了蓄光自发光型消防安全标志产品的应用。

Research on color field choice concept and color measurement method of retroreflective safety signs for mines;

逆反射型矿山安全标志的色域选择理念及测色方法研究