1. a round-headed bolt for timber; threaded along part of the shank; inserted into holes already drilled. 
   加工木料用的圆头螺栓；部分连杆有螺纹；可以插入事先钻出的孔中。
2. a threaded hexagonal or square-headed bolt with a nut; tightened with a wrench; used to connect metal parts. 
   一种带有螺母的六角形或圆头螺纹螺丝；用扳手拉紧；用于连接金属。
3. shotcrete and rock bolt 
   喷锚支护
4. a headed column; headed notepaper. 
   有标题的专栏；有标题的信纸。
5. My bolt is shot. 
   我已尽了最大努力。

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