常見(jiàn)例句A siliceous rock of chalcedonic or opaline silica occurring in limestone. 矽石出現(xiàn)在灰?guī)r中的玉髓或蛋白色矽石This rock contained chalcedonic cement before it underwent diagenesis, a process where low temperatures and low pressures alter the content of sediments before they finally lithify, or turn into rock. 在它經(jīng)歷成巖作用之前，它含有燧石質(zhì)的膠結(jié)成分。成巖作用過(guò)程中，低溫觝壓改變了沉積物的成分，而後固結(jié)成巖。a siliceous rock of chalcedonic or opaline silica occurring in limestone 出現(xiàn)在灰?guī)r中的玉髓或蛋白色矽石chalcedonic chert 玉髓狀燧石 返回 chalcedonic