Marlstone is a limestone based clay that acts similar Marl.泥灰岩石是与泥灰作用相似的一种以石灰石为基础的粘土.I will lay the foundation of the roof with the marl.我要用这些泥灰苫背屋顶.Hydrocarbon - generating process of marl is discussed by hydrous pyroly...
Relax as much as possible and keep breathing steadily.尽量放松，保持平稳呼吸。The nation's unemployment rate has been climbing steadily since last June.自去年6月以来，该国的失业率一直在不断上升。Teenage conceptions have risen steadily in the last t...