1.
A rock composed of compacted volcanic ash varying in size from fine sand to coarse gravel.
凝灰岩致密火山灰构成的岩石，大小以细粒至粗砾石不等
2.
Small gritstone-built houses and cottages of a somewhat sordid aspect stood on either side of the street.
街道两边是外表有些肮脏的粗砾石建成的小屋和村舍。
3.
A layer of coarse gravel is often placed around the drain tile.
常常在排水瓦管周围铺一层粗石砾。
4.
Minute rough granules, as of sand or stone.
砂，砂砾，砂粒细小的粗颗粒，如砂和石头粒
5.
Coarse gravel or crushed rock laid to form a bed for roads or railroads.
道碴用来铺公路或铁路路基的粗砂砾或碎石
6.
coarse beach gravel of small water-worn stones and pebbles (or a stretch of shore covered with such gravel).
水磨石和小鹅卵石构成的粗糙的海滩砾石（或覆盖这样的砾石的一片海滨）。
7.
The loose gravel traps are therefore being replaced by rough tarmac.
因此，松散的沙砾缓冲区被粗糙的柏油碎石面取代。
8.
in the west sea area of the Bashi Channel, the coarse sediments are dominated with sandstone rock and gravel;
巴士海峡以西海区沉积物较粗,常含砂岩块和砾石;
9.
A rock consisting of pebbles and gravel embedded in cement.
砾岩由水泥固结的卵石和砾石形成的砾岩
10.
Effects of Gravel on Water Retention Capability of Purple Gravelly Soils in a Hilly Area
砾石对丘陵紫色砾质土持水性的影响
11.
Study on Water Retention Capability of Purple Rock Fragment Soils in Hills
丘陵紫色砾质土/砾石土持水性研究
12.
Gravel is an unconsolidated mixture of rock fragments or pebbles.
砂砾是砾石岩石碎片或卵石的松散的混合物。
13.
formation-to-gravel size ratio
地层砂与砾石粒度比
14.
gravel fluid mixture
砾石与液体的混合物
15.
gravel-slot combination
砾石与割缝的尺寸组合
16.
rathole gravel slurry
井底口袋内的砾石砂浆
17.
surface gravel pack
地面倾倒式砾石充填
18.
GP shear-out safety joint
砾石充填剪切安全接头