It can contract into the shape of a little round stone, and sit perfectly still on the seafloor.

它可以收缩成一个小圆石的形状，并完全静止地坐在海底。

youdao

I didn't see a big round stone.

我没看见一块圆圆的大石头。

youdao

The kid picked the smooth and round stone without hesitation.

孩子毫不犹豫地拿起那块圆润的石头。

youdao

The round stone structure honors people from the District of Columbia who died in World War One.

VOA: special.2009.05.25

A farmer could save on wood or stone with a round design that needed less material than traditional barns.

VOA: special.2009.12.29

The 128 rooms, all at least 800 square feet indoors, have private plunge pools on their decks and round stone baths in their courtyards.

FORBES: Head to Head

The girls had done their job well but the Swiss stone was close to the button and there was a red guard blocking so I had to draw the stone round from the left, miss the Swiss guard and put the stone right in the centre of the house.

BBC: Rhona Martin tips Great Britain for double medals

The pueblo of grass roofed buildings, round river-stone plazas and pre-Colombian magic is off limits to camera-clad foreigners.

BBC: Colombia��s spiritual centre