In an unpolluted ocean, pretty well anything which had this smell would be edible-or, at least, harmless.

在一个没有污染的海洋里，任何有这种气味的东西都是可以食用的——或者至少是无害的。

I envy you your peace of mind, your clean conscience, your unpolluted memory.

我羡慕你内心的平静，你的良心清白，你没有污染的记忆。

" Hetch Hetchy water is the purest of all to be found in the Sierra, unpolluted, and forever unpollutable" .

“Hetch Hetchy 的水是 Sierra 中最纯净的水，未受污染，而且永远不会受到污染”。