writing-gun cathode

例句：

1. 1.The writing-gun cathode is crucial for the functioning of the pen.
   写作枪阴极对于笔的功能至关重要。
2. 2.During the experiment, the writing-gun cathode was used to measure the electrical resistance.
   在实验中，写作枪阴极被用来测量电阻。
3. 3. The writer's writing-gun cathode was found to be more efficient than the traditional one.
   作家使用的写作枪阴极比传统阴极更高效。