The detection abilities of these plants are similar to or better than those of dogs, Professor Medford said.

而梅德福教授认为这些植物的侦查能力类似于，甚至高于犬类的侦查能力。

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The fluidity of perceptions of past presidents reflects contemporary concerns, according to Edna Medford, a survey leader and participant.

调查负责人及参与者埃德娜。梅德福说，排名的变动受到如今人们关注点的影响。

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'Plants can't run or hide from threats,' Professor Medford said, 'so they've developed sophisticated systems to detect and respond to their environment.'

“植物不能躲避这些有害刺激，”梅德福教授说道，“所以它们演变出一套复杂的自我保护机制来侦察和应对外部环境干扰。”

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Edna Medford is a professor of history at Howard University in Washington,D.C.

VOA: special.2009.02.27

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This strikes a chord with Chris Grande of Walnut Hills Advisors, a firm in Medford, Mass.

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