Within a month, both the texture and condition of your hair should improve.

不出一个月，你头发的质地和状况应该都会改善。

《柯林斯英汉双解大词典》

The reports said blond hair was caused by a recessive gene, so both sides of the family have to have it to extend the shade into the next generation.

报道中说金发是由一种隐性基因造成，因此只有在家庭中的双方都携带这种基因的情况下这种发色才能遗传给下一代。

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That was their pleasure! To quarrel who should hold a heap of warm hair, and each begin to cry because both, after struggling to get it, refused to take it.

这就是他们的乐趣！争执着该谁抱那堆暖和的软毛，而且两个都开始哭了，因为两个人争着抢它之后又都不肯要了。

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Scientists have developed a forensic test that can predict both the hair and eye colour of a possible suspect using DNA left at a crime scene.

BBC: Forensic test can predict hair and eye colour from DNA

From the moment they were born, they looked like her or they looked like their father, or, sometimes, they looked like a combination of both: her hair and his eyes, his mouth and her nose, her chin and his smile.

NEWYORKER: M&M World

Eggs also provide biotin, a structural component of both bone and hair.

CNN: What you eat can improve your health, mind, and appearance