average size的用法和樣例：
例句
- Of the many Californian groups, most were composed of independent territorial and political units that were smaller than the average groupings of other North American Indians.
其中有許多集團是由獨立的區域單位及政治單位組成，比其他北美洲印第安人的平均規模小。 - The size and horsepower of the average U.S. automobile increased steadily.
美國汽車的平均尺寸和馬力在不斷增加。
