At the same time, by enlarging the source of parents and adopting composite crosses, the defects of low genetic variability and genetic uniformity of low gossypol cotton can be overcomed.
同时,采用拓展亲本来源、复合杂交等手段,克服了低酚棉遗传变异率低,以及遗传单一的弊端。
For parents, their children's enrollment is a source of joy and pride.
对父母来说,他们的孩子去上大学也是他们快乐和自豪的源泉。
These exceptions are the source of endless frustration for the parents of the vast majority of children who develop the ability to read at a typical rate.
这些特例是大多数父母想把他们的孩子的阅读能力达到这一种典型速度而始终失败的原因。
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