采用传统的自然变异繁殖方法育种周期长，效果又不明显。
Natural variation is one of the traditional reproduce methods, not only its breeding cycle is too long, but also produces little effect.
采用传统的自然变异繁殖方法育种周期长，效果又不明显。
Natural variation is one of the traditional reproduce methods, not only its breeding cycle is too long, but also produces little effect.
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