凸: bulge; protrude头: 5点就得动身 have to start before ...螺丝: screw凸头螺钉: raised head screw; raised-head screw凸头螺栓: raised head boltt头螺丝: t head bolts头螺丝: t head bolts凹头螺丝: socket screw半圆头螺丝: half-round head screw杯头螺丝: cucentre; hexagonal socket head cascrew扁头螺丝: flat head screw; thumb head screw槽头螺丝: slotted head serew; slottedheadserew槽头螺丝刀: recessed-head screw-driver瓷头螺丝: porcelain head screw大头螺丝: thum crew; thumb screw堵头螺丝: plug screw高平头螺丝: cheese head screw贯头螺丝: tommy screw锅头螺丝: panhead screw尖头螺丝: stiftschraube bolt with thread两头螺丝钉: dowel screw六角头螺丝: allen key; hexagonal head screw埋头螺丝: countersink head screw; countersunk bolt; countersunk screw; sunk screw平头螺丝: cap screw; flat head screws; grub screw平头螺丝钉: pan head screws
