But never mind that; it doesn't matter.

可别介意; 没有关系。

Never mind the tortuous explanation; tell me in plain English, are you coming or not?

别拐弯抹角地解释了, 直率地告诉我, 你?

Never mind the interruption; proceed with your story.

理睬别人的插话, 继续讲你的故事。

Never mind the washing-up—we haven’t got time.

别管盘子的事情了，我们时间够了。

Never mind the exact technical specification; just give us a free translation of what the machine can do.

别在意有确的技术说明, 只把那机器的功用给我们意译一下就可以了。

Never mind the expense!

用担心费用！