这两阶段杂交育种的结果是，尽管杂交牡蛎重来没有真正意义上的自身繁殖，但可以为市场提供大量的杂交牡蛎。
The result of this two-stage crossbreeding process is that, though none of the hybrids involved breeds true by itself, a marketable hybrid oyster can nevertheless be turned out in large quantities.
基因工程从来没有根据传统杂交育种中应用的植物正常繁殖过程。
It is never based on the plant's normal reproductive processes, which are used in traditional cross-breeding.
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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