Either way, it seems the old lore that a dandruffy scalp just needs a thorough " cleaning" might be a little flaky.

不管怎样，头屑头皮需要彻底“清洁”的古老说法似乎有点离谱。

They sequenced DNA from the heads of people with healthy hair, and from others with dry, dandruffy scalps—none of whom had used anti-dandruff shampoo within the last six months.

他们为头发健康的和头皮干燥有头屑的两类人士做了头皮 DNA 测序，这些人六个月内都未使用去头屑洗发水。

They sequenced DNA from the heads of people with healthy hair and others with dry, dandruffy scalps—none of whom had used antidandruff shampoo within the last six months.

他们对头发健康的人和头皮干燥、头皮屑多的人的头部进行了 DNA 测序——这些人在过去六个月内都没有使用过去头屑洗发水。