砂粒要求洁净，不应有木屑、石块等杂物，粒径在1 ~2毫米之间，使用前要炒干。

Clean sand requirement, there should be no sawdust, stones and other sundry, particle size between 1 ~ 2 mm, Fried dry before use.

youdao

砂粒要求洁净，不应有木屑、石块等杂物，粒径在1 ~2毫米之间，使用前要炒干。

Clean sand requirement, there should be no sawdust, stones and other sundry, particle size between 1 ~ 2 mm, Fried dry before use.

youdao