He had a small tuft of hair on his chin.

他下巴上有一小撮胡须。

《柯林斯英汉双解大词典》

Little Soldier blew a sloppy raspberry (of thanks, most likely), her pudgy hands flailing and groping and finally managing to curl around a soft tuft of her father's hair, holding to it tightly.

小战士啵了啵嘴(大概是感谢的意思)，胖乎乎的双手舞动摸索着，最后决定紧紧揪着她爸爸的一簇软发。

youdao

A tuft of hair trapped in permafrost around 4, 000 years ago has yielded DNA for the first sequence of an ancient human genome.

发现于约4000年前的冻土中的一簇头发携带有一个古人类基因组的第一个序列的DNA。

youdao

Slender, sheathed in black leather, with short ebony hair sticking up in a tuft, her fingers sticking out of black woollen gloves as they skitter across a keyboard, Mara cuts through scene after scene like a swift, dark blade.

NEWYORKER: The Girl with the Dragon Tattoo