英语翻译The estimates that we have are lookng at what happens today a_英语解答

英语翻译
The estimates that we have are lookng at what happens today as a result of past exposure.So one-thrd of cancer deaths today would have been avioded had these lifestyle and environmental exposures not been present.
翻译,并解释下第二句是什么结构?
可能会追问,麻烦留意

人气：484 ℃　时间：2020-03-30 04:11:54

解答

这些估值是我们观察今天发生的过去曝光的结果.所以如果没有产生这些生命形态和环境暴光的话,今天三分之一的癌症死亡都应该避免.
would have done.had是虚拟结构,意为：如果没有.