Never mind who told me. That's of no importance.

别介意谁告诉我的，那不要紧。

《新英汉大辞典》

"Was his name David?"—"No I don't think it was, but never mind, go on."

“他的名字是大卫吗？”——“不，我想不是，不过没关系，继续。”

《柯林斯英汉双解大词典》

"I never seed no sense in th' Doxology afore," he said hoarsely, "but I may change my mind i' time."

“我以前对赞美诗从来没什么感觉。”他声音嘶哑地说，“但我现在可能已经改变我的想法了。”

youdao

Never mind that you have no recollection whatsoever of having entered a sweepstakes.

FORBES: Bah Humbug As Sweepstakes Telephone Con Artist Gets Prison

Never mind that I had no clue what to do.

FORBES: From Dropout to Six-Figure "Book Mama": The Un-Schooling of Linda Sivertsen

Never mind that it makes no sense.

FORBES: Loyalty Programs Get Way Out Of Hand