sand and gravel

基本解释

The prospector panned off bits of sand and gravel scooped from the bed of a stream.
探鑛者淘選從河牀中挖出的少量含金泥砂和沙礫。
The fossils were embedded in sand and gravel that were likely laid down by a river.
這塊化石嵌在了可能是某條河流所沉積的沙和礫石之中。
We dug our pans into black sand and gravel and began swirling and sifting until only a large tablespoon's worth of material was left.
我們在採金鍋裡裝進黑色的沙土和礫石，開始不斷的搖動和篩選，最後衹賸下一湯匙那麽多的東西。

This plant turns debris from buildings - many destroyed by Israeli air strikes - into sand and gravel that is then turned into cinder blocks for building.

Major activities in the area are agriculture, forest management, sand and gravel extraction, industry (diverse types), and ecotourism.
UNESCO: EDUCATION
Days ago bused-in prison inmates worked shoulder to shoulder with the National Guard and local volunteers to build a makeshift floodwall of sand and gravel.
NPR: More Rain Expected For Already Swollen Rivers
Mr. CHRIS LOVE (Sand And Gravel Worker): Here, we welcome him.
NPR: Charles Taylor Still a Controversial Figure in Western Africa