obligatory
🇺🇸
/əˈblɪɡətɔːri/
🇬🇧
/əˈblɪɡətri/
adjective
R
required by law or rule
Wearing a helmet is obligatory for all cyclists.
所有騎自行車的人都必須戴安全帽。
R
expected or usual
The obligatory family photo was taken after dinner.
晚餐後拍了例行的全家福照片。
translation
強制性的, 慣常的