weak variation

例句：

1. 1. The weak variation in the population has led to a decline in productivity.
   人口中的弱点变异导致了生产力的下降。
2. 2.The scientist discovered a weak variation that could be used to improve crop yields.
   科学家发现了一种弱点变异，可以用来提高作物产量。
3. 3.The weak variation in genetics can lead to unexpected results when breeding new species.
   基因的弱点变异在育种新物种时可能会导致意想不到的结果。