obligatory
🇺🇸
/əˈblɪɡətɔːri/
🇬🇧
/əˈblɪɡətri/
adjective
R
required by law or rule
Wearing a helmet is obligatory for all cyclists.
所有骑自行车的人都必须戴头盔。
R
expected or usual
The obligatory family photo was taken after dinner.
晚餐后拍了例行的全家福照片。
translation
强制性的, 惯常的