blackband

例句：

1. 1. The black band on his shirt is a symbol of his status.
   他衬衫上的黑色条纹象征着他的社会地位。
2. 2.The black band on the door is for security purposes.
   门上的黑色条纹是为了安全目的。
3. 3. The black band on the flag represents the country's unity.
   国旗上的黑色条纹代表着国家的团结。