VOA慢速英语2013.05.10 宾夕法尼亚, comparison, University, 的, 品质

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When is a plant considered a weed? Experts at Penn State University have a simple answer: When the undesirable qualities outweigh the good qualities.什么时候植物会被当成杂草?宾夕法尼亚州立大学的专家们给出了一个简单的答案:当其不良品质超过优良品质时.
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