In the beginning, human beings viewed the natural forces of the world - even the seasonal changes - as unpredictable, and they sought through various means to control these unknown and feared powers.

一开始，人类把世界上的自然力量，甚至季节的变化都看成是不可预料的。他们试图通过各种方式去控制这些未知的，令人恐惧的力量。

youdao

Wildcards - the funky question marks where a type parameter should go - are a means of expressing a type constraint in terms of an unknown type.

通配符—使用一个奇怪的问号表示类型参数—是一种表示未知类型的类型约束的方法。

youdao

It means that vast, unknown stretches still lie before us, fertile territories just waiting for us to cultivate them.

这意味著那摆在我们面前巨大的未知的地域﹐只是等待我们去发掘它。

youdao

Idiopathic means the cause is unknown.

VOA: special.2010.11.02

This intense heat they project in a parallel beam against any object they choose, by means of a polished parabolic mirror of unknown composition, much as the mirror of a lighthouse projects a beam of light.

VOA: special.2010.09.01

Robert Chalmers, 59, denies murdering Samantha Wright "by means unknown" and hiding her body in a garden bin.

BBC: Samantha Wright murder trial shown CCTV footage

Mr Kane is accused of hitting his gran on the head with a blunt implement, applying pressure to her neck by means unknown and murdering her.

BBC: Kathleen Milward's grandson Garry Kane 'bought heroin'

Prosecution lawyers claim that Mr Conning seized hold of her, locked the front door of the property and prevented her from escaping before striking her by means unknown.

BBC: Man on trial over woman's fall from Dundee high rise