They are safety signs to help workers see the dangers at the work.求高手指教.

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They are safety signs to help workers see the dangers at the work.求高手指教.
They are safety signs to help workers see the dangers at the work.求高手指教.

They are safety signs to help workers see the dangers at the work.求高手指教.
他们是安全标记,是用来帮助工人们看见工作过程中的危险的.

它们是用来帮助工人们注意到工作中的危险的安全标志。

他们是安全警示标志帮助工人在工作中注意安全