Lots of river stone. Local materials.

有很多河里的石头，是本地材料。

youdao

The Yangtze River Stone can be classified to a lot of types, such as landscape stone, embossment stone, shape stone, colorful stone, texture stone, etc.

长江奇石出现在长江流域，比如四川的宜宾和泸州。长江奇石以画面为主，有浮雕石，造型石，色彩石和纹理石。

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“I remember quite clearly one of my middle-school teachers telling me that I was a stone with sharp, jagged edges, but that I would turn into a smooth river stone as I grew older, ” Mr. Zhao said.

我记得很清楚一位中学老师说过，我是个棱角尖利的石头，不过随着年龄的增长，我会变成光滑的鹅卵石。

youdao

Architect Edward Durrell Stone designed a simple white building that overlooks the Potomac River.

VOA: special.2010.10.29

Remnants of its 74 stone locks, as well as brick aqueducts that brought it water from the river,remain.

VOA: standard.2010.04.29

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

Researchers are assessing the riverbed in the deep Anchor Stone channel, down river from Dittisham.

BBC: Research into River Dart's tidal power potential

On a hot Sunday in 1999 three miners find a thin, triangular stone in a muddy Brazilian river.

FORBES: Fracture Lines