砂石的英文：
freestone
sandrock

参考例句：

A brownish - red sandstone used as a building material.
褐砂石棕红色砂石，用作建筑材料

The surrounding country is a wilderness of sand.
周围是茫茫一片砂石地。

to scatter gravel on an icy road
在冰冻的道路撒上砂石

A house built or faced with brownish - red sandstone.
褐砂石房屋用褐砂石建的或用褐砂石糊表面的房屋

Here he had the opportunity of learning at least the rudiments of freestone working
在这儿，他至少有机会学一学用自由砂石作原料而工作的初步知识。

"Collect animals found on the sediment surface. Put them in a tray, identify and count them."
先收集砂石表面的动物,放在胶盘上点算和鉴别。

freestone是什么意思：
n. 砂石;核肉分离的果实

Here he had the opportunity of learning at least the rudiments of freestone working
在这儿，他至少有机会学一学用自由砂石作原料而工作的初步知识。

sandrock是什么意思：
砂石; 砂岩