大是大非
major issue of right or wrong;major issue of yes or no; huge stake; cardinal question of right and wrong
中國(guó)在這個(gè)～的問題上決不含糊。Given the stakes involved in this issue. China will not yield any ground(or has no room for flexibility).
大是大非dà shì dà fēi
屬于政治原則性的是非問題。major issues of principle, cardinal questions of right and wrong, an issue of principle, a matter of principle, right and wrong on issues of major importance