Secon
abbr. secondary electron conduction orthicon 次级电子导电正析像管
🗣️ 情景例句
But first in the school-rooms.
但首先是在教室 。
A work ill done must be twice done.
未做好的活，需要重新做。
I'm sorry you feel that way.
你这么说，太令人遗憾了。