shell marl造句

例句与造句

1. In the central and eastern parts of the town there are several rich beds of muck and shell marl.
2. The globally rare interstitial amphipod, " Stygobromus araeus ", is closely associated with the groundwater in shell marl or limestone deposits.
3. It's difficult to find shell marl in a sentence. 用shell marl造句挺难的