toughadj.强硬的；棘手的，难办的；艰苦的；严厉的；牢固的，强壮的；坚强的，坚韧的adv.以强硬的态度；强硬地，顽强地n.暴徒; 恶棍tough out咬紧牙关挺过

1. Joe is a yellow-bellied guy; don't send him on such a tough assignment.
   乔是个胆小鬼，不要把这样艰难的工作交给他。