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1.This wedge-nut expansion shell bolt is designed to securely hold the door open.
这个楔形螺母扩张壳体螺栓设计用来牢固地保持门打开。
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2. The wedge-nut expansion shell bolt was used to reinforce the frame of the building.
楔形螺母扩张壳体螺栓被用来加固建筑物的框架。
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3.The wedge-nut expansion shell bolt was a critical component in the construction of the bridge.
楔形螺母扩张壳体螺栓是建造这座桥梁的关键部件。