Her discovery was evidence of a highly controversial theory at the time — extinction.

她的发现证明了当时一个极具争议的理论——灭绝。

And it certainly doesn't support Heyerdahl's controversial theory that Polynesian culture derives from settlers from South America.

当然，这项研究也不支持海尔达尔具有争议的理论，即波利尼西亚文化起源于南美移民。

These observations led him to propose a controversial new theory: perhaps these and many other continents had once been connected in a single, gigantic landmass.

这些观察使他提出了一个有争议的新理论：也许这些大陆和许多其他大陆曾经连接在一个巨大的大陆上。