She is also considerably more of an enigma: One in four Americans were unfamiliar with or had no opinion of her.

而且她也更像是一个谜：有四分之一的美国人不熟悉她，或是对她没有印象。

youdao

Nevertheless, voles are an "evolutionary enigma" with many bizarre traits, DeWoody said.

但是野鼠是包含许多奇怪特性的“进化中的谜”，代物第说道。

youdao

And while there are new drugs and treatments constantly being tested, some with good rates of success, cancer is still largely an enigma.

NPR: Startling New Evidence Cancer Is Contagious

Love him or hate him, the philandering pol with a pizzerial past is a mystery wrapped in a chimera nestled in the inner sanctum of an enigma buried deep inside yet another chimera.

WSJ: Joe Queenan on Barbara Walters's Most Fascinating People | Moving Targets