Make sure it's clean river sand, not beach sand.

确保那是干净河沙，不是海滩的沙子。

youdao

Ours took about 90 minutes to assemble and walked across most flat surfaces, even packed beach sand and slight inclines.

我们花了90分钟时间把这个迷你机械生物组合好、它可以走过大多数平坦的表面，甚至紧实的沙地和小斜坡。

youdao

The result is a row of samples shifting from the relatively dark, coarse grains of the Northeast to the fine white beach sand of the Southeast.

结果就是看到的这组样本，从东北海岸相对暗一点粗糙些的沙子到东南海岸这些白皙且细腻的沙子。

youdao

Chappaquiddick has a white sand beach at the Cape Poge Wildlife Preserve.

VOA: special.2011.07.25

But the ingredients really are beach sand, energy and some know how and not a great deal else.

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Vaguely analogous to grains of green Hawaiian beach sand, chondrules are arguably the glue needed to make planets like ours.

FORBES: Planets Made Easy: The Cosmic Glue That Binds Us All

Storm waves and high winds have washed away thousands of tonnes of beach sand in front of the launching area for a Norfolk lifeboat.

BBC: Lifeboat launch area washed away by tides and storms