1.The research team found that on average, today's children run one kilometre about one minute slower than their parents did three decades ago.
on average平均起來
On average, American firms remain the most productive in the world.
總體來講,美國公司在全球范圍內還是產值最高 。
2.They need to choose a range of physical activities they like or think they might like to try, and they need to get moving.
a range of一系列; 一些
They talked amiably and easily about a range of topics.
他們友好而隨意地談論各種話題 。