obligatory
英 [?'bl?g?t(?)r?]
美[?'bl?ɡ?t?ri]
- adj. 義務(wù)的；必須的；義不容辭的
英英釋意
- 1. morally or legally constraining or binding;
- "attendance is obligatory"
- "an obligatory contribution"
- 2. required by obligation or compulsion or convention;
- "he made all the obligatory apologies"