通常要求打黑色领结的活动，一定是非常非常正式的活动。

When an event is black tie, it means it's very, very formal.

youdao

第一，如果你的婚礼在晚上六点以前，你不能穿黑色领结无尾燕尾服或者白色领结有尾的。

First off, if your wedding is before 6 in the evening, you should not wear a tuxedo (black tie) or tails (white tie).

youdao

如果邀请函上说黑色领结，这意味着男士穿晚宴套装并且佩带一个黑色或白色的蝴蝶结领结。

If the invitation says black tie this means a dinner suit for men with a black or white bow tie.

youdao