Natural selection will preserve sequences with vital functions, but the rest of the genome will change because of drift.
自然选择将保存重要功能的基因序列，但是其他基因会因为漂变而被改变。
“Natural selection is shaping the Y and keeping it vital to a degree that is really at odds with the idea of the last 50 years of a rotting Y chromosome, ” Dr. Page said.
佩奇博士说：“自然选择塑造了Y染色体，50年来，我们为Y染色体的退化争论不休，自然选择论更是加剧了这种争论。
Material selection was vital to the project's underlying concept.
项目深层概念的关键是材料的选择。
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