That's sometimes confusing for people, because it seems like okay, is it a photon or is it an electron.

有时候这对人们来说是令人迷惑的，因为它看起来好像是对的，它是一个光子还是一个电子？

麻省理工公开课 - 化学原理课程节选

The notion of contingent identity is very puzzling.

偶然同一性是很令人迷惑的

耶鲁公开课 - 死亡课程节选