inviolable; [of an arrangement] not to be altered under any circum stances; unshakable; unyielding
? 這是最后定下來的安排，～。This is the arrangement which has been finally decided on. It cannot be altered under any cir cumstances.
雷打不動
unshakable; unyielding; not to be altered under any circumstances
～的決心unshakable determination
雷打不動léi dǎ bù dònɡ
形容決心和意志堅定，不可動搖；也形容做事穩(wěn)重，嚴格按規(guī)則辦。unshakable, not to be shaken by thunder, not to be altered under any circumstances