If gravel is used, it usually contains sufficient clay and fine material to help stabilize the surfacing.

如果用了砾石，通常它包含了足够的粘土和细密的材料以帮助路面的稳定。

youdao

While part of the process involves conventional craftsmanship - moulding clay - this is not presented as sufficient.

虽然这一进程的一部分涉及到传统工艺-模粘土-这是没有提供足够的。

youdao

Results from the test indicated a clay substitute was sufficient to control clays welling.

测试结果表明，一种黏土替代物可以有效地抑制黏土膨胀。

youdao

The reason: All four of the top American hopes possess serves and groundstrokes which are strong enough to be weapons on any surface, and the slow, high bounce on clay brings the ball into their hitting zone with sufficient time for them to set up their shots.

WSJ: Americans Produce Feats on Clay