Ignitron
[电] 水银半波整流管
🗣️ 情景例句
This has been a hard course for me.
这门课对于我来说很难。
He who would climb the ladder must begin at the bottom.
爬梯必须从底层开始。
The conference was very well organized. Everything began and finished on time.
会议安排的很好。开始和结束都准时。