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
Remove nuts, U-bolts and spring bracket from axle.
由车轴拆下螺帽，U型螺栓和弹簧支架。
3
Products included are bolts, screws, studs, U-bolts, preassembled screw and washer assemblies (sems), and products manufactured the same as sems except without washer.