There wasn't a speck of dust anywhere in the room.

屋子里一尘不染。

《牛津词典》

There isn't a speck of dust anywhere in the house.

整间房子一尘不染。

《牛津词典》

Billy leaned forward and brushed a speck of dust off his shoes.

比利俯身刷掉鞋上的一点灰尘。

《柯林斯英汉双解大词典》

Whether a speck of dust is man-made or natural can be worked out from its trajectory.

ECONOMIST: Orbital debris

The capsules are made in ultra-clean conditions a speck of dust could ruin the effect.

ECONOMIST: Germany's export champions

Physically, the DNA carrying all that information is no bigger than a speck of dust.

BBC: DNA 'perfect for digital storage'