What's with all the black arm bands?

他们怎么都戴着黑袖标？

The two black bands around their neck give them their name.

他们的得名源于脖子周围有两圈黑色环带。

The well-known colors of Brewster's club appeared — a red and black band round the chest.

布鲁斯特俱乐部著名的颜色出现了——一条红黑相间的带子环绕在胸前。

The black band on his arm reminded her to say: " I'm so sorry to hear of your trouble" .

他手臂上的黑带提醒她说：“听到你的麻烦，我很难过”。

This makes it possible to show existing video content that has been “upscaled” for Ultra HD without the need for black “letterbox” bands above and below the picture.

这样就有可能播放已升级为超高清模式的视频，而且去除了画面上下的黑边。

There was also a woman's black and white tailored suit, mostly white, black and white shoes under it, a Panama with a black and white rolled band on a shelf above it.

还有一套女式黑白相间的剪裁西装， 里面的鞋大多是白色的， 黑白相间的鞋子， 上面的架子上放着一条黑白相间的卷边带子的巴拿马。