hammer head bolt

例句：

1. 1. The car'sengine is a hammer head bolt.
   这辆车的引擎是一个锤头螺栓。
2. 2. The constructionworkers used a hammer head bolt to securethe wooden beam.
   建筑工人用一个锤头螺栓来固定木梁。
3. 3. The engineertightened the hammer head bolt to ensurethe door was securely closed.
   工程师拧紧了锤头螺栓，确保门被安全地关闭了。