An atoll is a ring - shaped island that encloses a central lagoon.环礁是一座环状的岛屿,中心围起一团海水形成泻湖.The wall encloses the hospital.围墙将那所医院围在里面.A wall encloses the park.墙围着公园.An unspoilt coral reef encloses the bay.未受破坏的珊瑚礁环绕在海湾周围。...
通过化学絮凝, 活性炭吸咐及离子交换得容易将它们除去.They are removed more readily by chemical flocculation, activated carbon absorption and ion exchange.通过这种方法加速的过程称为絮凝.This process is enhanced through the operation known as flocculation.在制备箱中,絮...