symplectite

例句：

1. 1.The symplectite is a type of sedimentary rock that forms when water and sand are pressed together.
   压块石是一种沉积岩，当水和沙土被压实在一起时形成。
2. 2. The symplectite was formed by the ancient riverbed being buried under layers of sediment.
   压块石是由古代河流床被沉积物层所埋藏形成的。
3. 3.The symplectite has been used as a building material for centuries due to its strength and durability.
   由于其强度和耐用性，压块岩被用作数百年来的建筑材料。