求翻译：高速公路建设项目多属于大型建设项目，其对环境产生的影响往往是不可逆的，一旦产生环境影响，其后果可能会十分严重是什么意思？

Highway construction projects are mostly large-scale construction projects, its impact on the environment is often not reversible, once an environmental impact, the consequences could be very serious

Highway construction projects that are more than large-scale construction projects, and its impact on the environment is often irreversible, once, and the consequences arising from environmental impact may 10 sub-serious

The highway items of basic construction belong to the large-scale items of basic construction much, it the influence which produces to the environment often is irreversible, once has the environmental effect, its consequence possibly can serious extremely

Belonging to the large construction projects of highway construction projects, their impact on the environment is often irreversible, once you have an environmental impact, the consequences may be very serious

Belonging to the large construction projects of highway construction projects, their impact on the environment is often irreversible, once you have an environmental impact, the consequences may be very serious