It's a closed environment so workers here have been making their own soil since the project began in 2000.

它（伊甸园计划）是一个封闭的环境，这里的工作人员自2000年计划开始就一直在创造自己的土壤。

Sometimes buildings are even nested inside each other to prevent natural disasters from breaching the closed environment.

有时建筑物甚至相互嵌套，以防止自然灾害破坏封闭环境。

But you can spray this rank to death once you get into the taxi, where there's a closed environment, it's a capsule.

一旦你上了出租车，被感染的风险就会急剧上升，因为那是个封闭的环境，是密封车厢。

You wouldn't let them do that on the living-room floor but a sandbox is a controlled, closed environment where making a mess is allowed.

你不会让他们在客厅地板上那样做，但沙箱是一个受控的封闭环境，允许弄得一团糟。