容量單位一種液體容量單位，相當于一大酒桶的三分之一或42加侖（159升）
A measure of liquid capacity, equal to a third of a pipe, or42 gallons(159 liters).
把鋁和其他金屬混合，科學(xué)家們能夠制造出各種合金，其中一些具有鋼一樣的強度，但其重量只是鋼的三分之一。
By mixing aluminium with other metals, scientists have been able to produce a variety of alloys, some of which have the strength of steel but weigh only one third as much.
這一地區三分之一的地方都是森林。
One third of this area is covered with forest.
他們的工人每１０年左右才有三分之一的人離職更換工作。
Only a third of their workers turn over every10 years or so.
