of which的用法及例句

The cell is the unit of which all living organisms are composed.

细胞是构成一切生物的`单位。

The trip was magical; the stuff of which dreams are made.

那是一次奇妙的旅行，宛如梦境。

I saw three camp beds, two of which were occupied.

我看见了3张折叠床，其中两张已有人占了。

Many theories on punishment exist, all of which are variations on a theme.

关于惩罚的理论有很多，虽形式略有不同，但其主旨都是一样的。

We are dealing with an epidemic the likes of which we have never seen in this century.

我们面临的疫情规模在本世纪尚属空前。