A custom is a traditional practice--a mode of individual behavior or a habit of social life--that is transmitted by word-of-mouth or imitation, then ingrained by social pressure, common usage, and parental authority.

• 习俗即传统的风俗习惯，它或为个人的行为模式，或为社会生活习惯，经口头流传、动作模仿，加上社会的影响、祖辈的言传身教以及普遍被沿用，如是才根深蒂固。