shell rack

例句：

1. 1.The engineer designed the shell rack to supportthe heavy equipment.
   工程师设计了壳架来支撑重型设备。
2. 2. The shell rack wasmade of sturdy metal and could hold alot of weight.
   壳架由坚固的金属制成，可以承载很多重量。
3. 3. Theshell rack was installed on the roof ofthe building for easy access to the upperfloors.
   壳架安装在建筑的屋顶上，便于访问上层楼层。