1. a screw with a hexagonal hole in the head. 
   针头有六角形的孔的螺丝。
2. (trademark) a screw with a special head having crossed slots. 
   （商标）一种有十字型狭槽的特殊螺帽的螺丝。
3. a hand tool for driving screws; has a tip that fits into the head of a screw. 
   起螺丝的一种手工具；有一个可以插入螺丝头的尖端。
4. a heavy wood screw with a square or hexagonal head that is driven in with a wrench. 
   一种带有由扳手销入的正方形或圆形头儿的重材螺丝。
5. I think he has a screw loose in his head, or he wouldn't do such crazy things. 
   我觉得他的脑袋有点不正常，要不然他不会做出这样的蠢事来。

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