1.Among the indiscernibles are absolute space, time and direction.
人类至今尚未认识事物中有绝对空间、时间和方向。
2.The transition was almost indiscernible.
那转变几乎不能察觉。
3.The historical development of a language is hardly a sudden transformation of one language into another, but a gradual and constant process, often indiscernible to speakers of the same generation.