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

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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.

FORBES: Now China Sues The European Union Over Trade Dumping

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