Target Audience: Who is capable of basic communication in English, and aspires to get themselves understood at ease in more precise English, but find it difficult to progress totally on their own.
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光凭外观，你无从知道含有外源基因的花粉粒是否会毒害蝶儿，或是传播到几公里外使其他植株受精。
You can't tell, just by looking, whether pollen containing a foreign gene can poison butterflies or fertilize plants miles away.
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