Many types of clam escape predators by burrowing into the sea bed using alternating movements of their shell and of the soft, muscular foot contained within that shell.
许多蛤类利用双壳及内部柔软强健足部的交替运动在河床上掘洞来逃避天敌。
2
Then the hall is filled with an odd green light born of the double shell of the sky and the sea.
那时候，大厅充满了天空和海洋两层叠加所造成一种奇异的绿光。
3
The grains here are tiny fragments of a baby sea urchin shell.