inviolable; [of an arrangement] not to be altered under any circum stances; unshakable; unyielding
❍ 这是最后定下来的安排，～。This is the arrangement which has been finally decided on. It cannot be altered under any cir cumstances.
雷打不动
unshakable; unyielding; not to be altered under any circumstances
～的决心unshakable determination
雷打不动léi dǎ bù dònɡ
形容决心和意志坚定，不可动摇；也形容做事稳重，严格按规则办。unshakable, not to be shaken by thunder, not to be altered under any circumstances