Pound the roots with a heavy flat stone.

用又重又平的石头拍打树根。

youdao

The cabin has a flat stone for a threshold.

这间小屋用一块扁平的石头做门槛。

youdao

It looked like a flat stone but it was a turtle.

它看来象一块扁扁的石头，但却是一只乌龟。

youdao

The artist draws an image with oily ink onto a piece of stone or other flat surface.

VOA: special.2009.09.02

The speedboat from the Kuala Besut ferry pier rides high on the waves, skipping along the water like a flat stone flung by a petulant giant.

BBC: The perfect trip: Singapore and Malaysia

Blurred footprints, a smooth flat stone good for skimming.

NEWYORKER: Getting Closer

Those summers were when David felt most fully himself, trotting alongside Priscilla down the rocky streets, climbing at midnight up the slender path beside the stream to a large flat stone that they considered their own, reclining there shoulder to shoulder, talking without thinking as stars fell overhead.

NEWYORKER: Or Else