double U-groove

例句：

1. 1. The engineer designed a double U-groove to improve the efficiency of the machine.
   工程师设计了一个双U型槽来提高机器的效率。
2. 2. The construction crew used double U-grooves to reinforce the concrete slab.
   施工队使用双U型槽来加固混凝土板。
3. 3. The double U-groove was installed to support the weight of the heavy equipment.
   安装双U型槽是为了支撑重型设备的重力。