With almost no heavy industry on South Island, the air, water, and land are all free of pollution.

南岛上几乎没有重工业，空气、水和土地全都未受污染。

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Our natural mineral salts from the thousand-meter deep Jurassic layer are pure, natural, free of pollution, and safe.

本公司的千米侏罗纪地质层天然矿盐，纯净、天然、无污染，安全自然。

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Determining the iron content in organism by oxygen bomb burning incineration is easy to operate, fast to finish, free of pollution and reliable in different conditions.

用氧弹燃烧灰化法对有机物中铁的含量进行测定，方法操作简便、快速，实验过程无污染，测定结果可靠。

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The river was nearby, clear and free of all pollution, and petrol was easy to obtain, in unlimited quantities, from the filling stations and parked cars.

NEWYORKER: The Autobiography of J.G.B.

Congestion is indeed a big problem, but it must not be allowed to mask the seriousness of free-flowing traffic's contribution to pollution, climate change and the erosion of green spaces.

ECONOMIST: Excessive

Caviar produced in the Sologne, a rural, pollution-free region of central France, has found fans among French chefs.

WSJ: Black Gold: French Caviar Is �� la Mode