It later became apparent that rabbits were developing a degree of resistance to this disease, so that the rabbit population was unlikely to be completely exterminated.
后来，明显看出，兔子对这种疾病已产生了一定程度的免疫力，所以兔子不可能被完全消灭。
Two inbred lines of maize, ZA5716 and ZA6192, with high combining ability and disease resistance, were obtained from a breeding population improved by recurrent selection.
从轮回选择法改良的玉米育种群体中，选育出了配合力高、抗病性强的玉米新自交系za5716和ZA6192。
It is reasonable rather than random combination of the population can achieve the effect of disease resistance.
种群需要合理组合，而不是任意组合才能达到抗病的效果。
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