Obivously the bright orange bandana can be used to signal but bandanas also have many other USES.
明亮的橘红色手帕可以用来施放信号，但它的功用不仅仅只是这些。
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According to Hon Hai, on the morning of February 19 in juarez, a group of about 30 workers waiting for a company bus after the night shift "began to cover up their faces with bandanas in unison".