narrow-pillar file

例句：

1. 1. The narrow-pillar file is a crucial part of the project.
   狭窄的支柱文件是项目的关键部分。
2. 2. He used the narrow-pillar file to open the door.
   他用狭窄的支柱文件打开了门。
3. 3. The narrow-pillar file helped us solve the problem quickly.
   狭窄的支柱文件帮助我们迅速解决了这个问题。