clamshell
/ˈklæmʃəl/noun
1- the shell of a clam, formed of two roughly equal valves with a hinge蛤壳。
1.1
- a thing with hinged parts that open and shut in a manner resembling the parts of such a shell, such as a kind of mechanical digger, a portable computer, or a box for takeaway food蛤壳状物件（如挖泥器、笔记本电脑、快餐盒）：
some clamshells offer full desktop power
有些笔记本电脑提供全台面动力
as modifier a clamshell lid.快餐盒盖。