空气不能穿透土壤颗粒,这使得土壤中缺少氧气。
First, they considered the possibility that seasonal upwellings of toxic or oxygen-poor bottom water were responsible.首先,他们考虑了有毒的或者无氧的底部水流的季节性上升造成这种灾难的可能性。
The professional ones knew that the concreting construction was a very headachy problem in the oxygen-poor environment.内行人都知道,在高原缺氧的环境中,对于砼施工是个十分头痛的问题。