Researchers surmise that over billions of years the debris should collide, grinding the KBO-type objects down to ever smaller pieces that were not part of the original Kuiper Belt population.

研究人员推测数这些碎块经过数十亿年的互相碰撞，柯伊伯型天体磨得更碎，柯伊伯带原始状态不再。

youdao

But MND is relentless in its grinding down of both patients and those close to them, and it's a shock from which it is not easy to recover.

但是MND无情的折磨着患者的同时，也使他们身边的人痛苦不堪，尤其打击人的是它是很难康复的。

youdao

my first Saturday job was as a butcher's boy, sanding down the blocks, cleaning the walls and grinding the mince.

因为我的第一份业余工作就是给一个屠夫打下手，沙下肉块，清理墙壁，研磨肉糜。

youdao

"He turned towards me, he had both fists clenched... grinding down on his teeth, " PC Milby said.

BBC: Dale Burns inquest: Officer fired Taser 'out of fear'

However Ged Stokes' Haven side were back on the offensive soon after and put their powerful forward pack to use in grinding down the Thunder defence.

BBC: Gateshead 42-38 Whitehaven

It was as if his brain were grinding down.

NEWYORKER: Hellhole