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

　　細胞是構成一切生物的單位。

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

　　那是一次奇妙的旅行，宛如夢境。

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

　　我看見了3張折疊床，其中兩張已有人占了。

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

　　關于懲罰的理論有很多，雖形式略有不同，但其主旨都是一樣的。

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

　　我們面臨的疫情規(guī)模在本世紀尚屬空前。