much less和not to mention有什么区别？

much less
used to make a negative statement stronger:
At the age of fourteen I had never even been on a train, much less an aircraft.

not to mention
used when you want to emphasize something that you are adding to a list:
He's one of the kindest and most intelligent, not to mention handsome, men I know.

可见，much less只能修饰带否定色彩的句子，而not to mention则没有这个限制。

eventually
adverb
in the end, especially after a long time or a lot of effort, problems, etc:
Although she had been ill for a long time, it still came as a shock when she eventually died.
It might take him ages but he'll do it eventually.

ultimately
adverb
1 finally, after a series of things have happened:
Everything will ultimately depend on what is said at the meeting with the directors next week.
Ultimately, of course, he'd like to have his own business but that won't be for some time.

2 used to emphasi