Though hit is fun of playing firecrackers, we cannot play firecrackers without control in that playing firecrackers causes safe problems and environmental pollution .
尽管放爆竹非常有趣，我们也不能无节制地燃放烟花爆竹，因为燃放烟花会有安全隐患还会导致环境污染。 。
As we have seen, control of pollution via nuisance actions and direct regulation is not without its problems.
我们已经清楚妨害行为和直接管制污染并非是没有问题的。
To solve the pollution problem of dropping crude during field workover operation, a type of blowout controlling unit was researched and manufactured without the prerequisite of well control.
为解决油田修井作业落地油污染问题，研制出一种在不压井的前提下进行作业的防喷作业机。
应用推荐