Track ballast usually consists of crushed rocks or stone, but in some cases, less suitable alternatives, like burnt clay, are also used.

轨道道砟通常由碎石或石头组成，但在某些情况下，也使用不太合适的替代品，如烧粘土。

Construction includes several layers of fill crushed rock and Tennessee River stones on top.

建筑包括多层填充碎石和顶部的田纳西河石。

OF SLAVE-CRUSHED ROCK, DECORATED BY HUGE STATUES OF THE GODS AND KING ANTIOCHUS.

由奴隶压碎的岩石制成， 装饰着巨大的神像和安条克国王。

The pigments were discovered after researchers crushed 1.1bn-year-old rocks found in a marine shale deposit, beneath the Sahara desert, in the Taoudeni basin in Mauritania, west Africa.

研究人员碾碎距今11亿年的海相页岩后发现了亮粉色色素，该页岩位于西非毛里塔尼陶德尼盆地的撒哈拉沙漠底下。

When the crushed rock and tar track was replaced with brick, it earned the nickname " the Brickyard" — one it maintained even after the track was repaved with asphalt.

当碎石和沥青轨道被砖取代时，它获得了“砖厂”的绰号——即使在赛道重新铺设沥青后，它仍然保持着这个绰号。

The colours were discovered by a Phd student, Nur Gueneli, who had crushed the rocks to a powder. She then extracted and analysed molecules of ancient organisms from the substance.

这些色素是由一名叫努尔·格内莉（Nur Gueneli）的博士生发现的。她把这些石头碾碎成了粉末。 并从该物质中提取并分析了古代有机体分子。

It is made from a blend of crushed rock, rubber and polyurethane, a synthetic plastic that replaces bitumen as the binding agent and allows even bigger pores in the road surface.

它由碎石、橡胶和聚氨酯制成，人造塑胶聚氨酯可以代替沥青，因为这种粘合剂可以允许更大的气孔存在于路面。