They had to do with the riddle of his existence.

他们必须解开他的存在之谜。

youdao

According to that theory, possessing Shelly Kagan's personality is evidence of his existence.

根据那个理论，拥有 Shelly Kagan 的人格就是作为他存在的证据。

youdao

I was unaware of his existence until today.

直到今天我才知道有他这么个人。

《牛津词典》

In the nineteen sixties, Ray Davis Junior used the mine for his work showing the existence of solar neutrinos.

VOA: special.2009.07.21

In other words, his point is that good is only possible because of the prior existence of bad.

换句话说，他的论点是,善存在的可能,仅在恶的事先存在。

耶鲁公开课 - 政治哲学导论课程节选

The concept of the state was fundamentally new to Russia, but gradually came into existence, and his accomplishments had a lot to do with that.

彼得的治国理念对于俄国是前所未闻的,但也逐渐扎下根来,他的功绩即在于此

耶鲁公开课 - 欧洲文明课程节选

His existence has become part of local lore in the small Maine town of Rome.

BBC: Maine 'North Pond Hermit ' Christopher Knight held

Because what propels Brandon what offers thrust and torque, if not meaning, to his existence is sex.

NEWYORKER: Hot and Bothered

Currently 18 years old, his existence was only revealed to the rest of the world in 2001.

CENTERFORSECURITYPOLICY: The House of Kim