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。

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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。

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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。

youdao

In 2006, two-fifths or 40% of all working mothers relied on informal childcare, with grandparents being the most common source for a third of parents.

BBC: 'End of nuclear family' forecast

Mother had not liked having guests, particularly these guests, and this had been a recurring source of disagreement between my parents.

NEWYORKER: Naima

Next, we take action: I remind parents that food allergies are a proven source of stress, and I'm completely honest that the early adjustment period can be extremely difficult.

CNN: Food allergy diagnosis: What parents should know