Sedimentary describes things made from sediment — those tiny bits of rock, sand, and earth that sank and piled up, usually under water. The phrase you will meet again and again is sedimentary rock: rock that formed when those layers were pressed together over a very long time.

Sedimentary沉積的 describes描述的是 things made from sediment由沉積物形成的東西——those tiny bits of rock, sand, and earth那些細小的岩石、沙子和泥土碎屑，that sank and piled up沉下去堆積起來，usually under water通常是在水裡。The phrase you will meet again and again你會一直遇到的詞組 is就是 sedimentary rock沉積岩：that is也就是 over a very long time經過非常長的時間 those layers那些岩層 were pressed together被壓在一起後 formed而形成的 rock岩石。

Sandstone, limestone, and shale are the usual school examples.

Sandstone, limestone, and shale砂岩、石灰岩和頁岩 are是 the usual school examples學校常舉的例子。

It is almost a classroom-and-geology word; people do not use it much in ordinary chat.

It這個字 is almost幾乎是 a classroom-and-geology word教室和地質學才會用的詞；people人們 do not use it much不太會用它 in ordinary chat在日常聊天中。

Though actually, once you know it, you can look at a cliff of layered stone and say it looks sedimentary — stacked like pages, not cooked like volcanic rock, and not squeezed and changed like metamorphic rock. In geology talk it can also be used as a noun for that kind of rock, but the adjective is what learners meet first.

Though actually不過其實，once you know it一旦你認識了這個字，you can look at a cliff of layered stone你就可以看著一面層層堆疊的岩壁 and say並說 it looks sedimentary它看起來很sedimentary——stacked like pages像書頁一樣一層層疊著，not cooked like volcanic rock不是像火成岩那樣被燒過，and not squeezed and changed like metamorphic rock也不是像變質岩那樣被擠壓、改變過。In geology talk在地質學的說法裡 it它 can also be used as a noun也可以當名詞用 for that kind of rock指那一類的岩石，but the adjective但形容詞 is what learners meet first是學習者最先遇到的用法。