对不起，我只能做到这一步，我不能帮助他行骗。 I'm sorry but that's where I draw the line; I won't help him to cheat.
暗机关一种用来欺骗、行骗或欺诈的装置，尤指秘密地和欺骗地控制赌博器具的机械装置 A device employed to cheat, deceive, or trick, especially a mechanism for the secret and dishonest control of gambling apparatus.
我没想到你会堕落到去行骗。 I did not imagine that you would sink to cheating.