Definition: a usual and accepted way of behaving or doing something Level: C1
在许多国家，葬礼上穿黑色是一种习俗。
In many countries it is the ___convention to wear black at funerals.
年轻一代常常挑战社会的习俗。
Younger generations often challenge social ___convention.
见面时握手的习俗在许多文化中都很常见。
The ___convention of shaking hands when meeting is common in many cultures.
