But the biggest problem that any potential highway here faces is the massive local environmental damage that it will cause to a delicate ecosystem.

但任何可能在这里修建的公路所面临的最大问题是，它将对当地脆弱的生态系统造成巨大的环境破坏。

It creates some local damage, and then works its way down the respiratory tree kind of like a secret agent rappelling down a rope of mucus.

病毒在这里造成一定局部损伤后继续向下进入肺部支气管，有点像特工抓着黏液的绳子下降。