Somebody forgot to bring along the U-bolts to clamp the microphones to the pole.
有人忘记带来把麦克风夹在支杆上的U型螺栓。
《柯林斯英汉双解大词典》
2
The pressure gauge is designed of special Stainless Steel case and two-piece type for pressure element. The mounting types are Bottom mounting, Lower back mounting and Lower back Uclamp mounting.