geochemical barrier的用法和樣例：
例句
- They produce a barrier beach with an eroded zone in front and a lagoon or salt marsh behind.
它們形成了一個(gè)前有侵蝕帶后有瀉湖和鹽沼的堤洲堰灘。 - The present barrier bar was preceded by similary trending bars in the past and will be succeeded by more barrier bars in the future.
當前的堰堤砂洲是繼生于過(guò)去類(lèi)似走向的砂洲上的，而在以后必將有更多的堰堤砂洲相繼生成。
