名词
中文翻译：内部线
同义词：
['inner thread', 'internal wire', 'inner core例句：1. The engineer used a special tool to remove the internal thread on the bolt.（工程师使用特殊工具来移除螺栓上的内螺纹。）2. The machine had a complex internal thread that required special care during assembly.（这台机器有一个复杂的内部螺纹，在装配过程中需要特别的照顾。）']
例句：
-
1. The engineer used a special tool to remove the internal thread on the bolt.
工程师使用特殊工具来移除螺栓上的内螺纹。
-
2. The machine had a complex internal thread that required special care during assembly.
这台机器有一个复杂的内部螺纹，在装配过程中需要特别的照顾。
-
3.The screw was so tight that it could not be loosened without damaging the internal thread.
螺丝太紧了，无法松开，否则会损坏内部螺纹。