hard-headed hammer

例句：

1. 1. He is a hard-headedman who always thinks logically.
   他是一个固执的人，总是按逻辑思考。
2. 2. The managerwas hard-headed and refused tocompromise on the salary issue.
   经理很固执，在薪资问题上不肯妥协。
3. 3. She washard-headed about her career choicesand didn't want to change herplans.
   她对自己的职业选择很固执，不想改变计划。