Turns out, they found colorful bugs on almost all the toxic plants but less than half of the harmless plants. And black, brown and gray bugs didn't have a preference-they ate indiscriminately.

结果发现，几乎所有的有毒植物都存在彩色昆虫，但只有一半的无毒植物有彩色昆虫；而黑色、褐色和灰色的昆虫则没有这种偏好性，在采食时没有选择。

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Because they lack oxygen, marsh sediments are high in sulfides that are toxic to most plants.

由于它们缺乏氧气，沼泽沉积物中的硫化物含量很高，而硫化物对大多数植物都有毒。

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While mineral deficiencies can limit the growth of plants, an overabundance of certain minerals can be toxic and can also limit growth.

虽然缺乏矿物质会限制植物的生长，但某些过量的矿物质会使植物中毒，同样会限制植物的生长。

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In December, we finalized the first-ever national standards to limit mercury and other toxic emissions from power plants, helping safeguard the health of millions.

WHITEHOUSE: Presidential Proclamation -- Earth Day

In America, for example, landfills containing household rubbish are subject to stringent regulation, whereas ones filled with toxic sludge from power plants are less tightly controlled.

ECONOMIST: The waste industry

The technology in the newest plants limits toxic emissions of dioxins, a major issue with incinerators of the past, to levels similar to a backyard barbecue's.

WSJ: Grappling With a Garbage Glut