For example, did you know that 1 in 4 teenagers has tried marijuana?
比如,你是否知道4个青少年中就有1位曾经吸过大麻?
If he, or someone like him, were alive today, he might be able to tell us what to expect in the next fifty years.
如果他或是像他的什么人今天还活着的话,他大概可以告诉我们下一个50年后会发生什么事情。