单词	diatomaceous earth
释义	diatomaceous earth /ˌdʌɪətəˈmeɪʃəs / noun [mass noun] A soft, crumbly, porous sedimentary deposit formed from the fossil remains of diatoms.Diatoms have an extensive fossil record going back to the Cretaceous; some rocks are formed almost entirely of fossil diatoms, and are known as diatomite or diatomaceous earth.... The richest sources of diatom fossils are deposits of their skeletons known as diatomite, or diatomaceous earth. As the diatoms die, they sink to the ocean floor, becoming a thick ooze of decomposing matter, and eventually giving rise to deposits of the sediment called diatomaceous earth.
随便看	run away with runback run before one can walk run blocker run blocking run boat runce runch run chase runchick runchie runcible spoon runcinate runcinate-leaved runckle runckled runckly runcle Runcorn rund rundale run defence run defender run defense rundlet

英语词典包含243303条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。