excitation of direct current generator

例句：

1. 1. The news of the newinvention excited everyone in the room.
   这个新发明的消息让房间里的每个人都感到兴奋。
2. 2.Her enthusiasm for learning English was infectious.
   她对学习英语的热情是传染的。
3. 3. Theexcitement of the upcoming event has everyone onedge.
   即将到来的事件的兴奋让每个人都紧张起来。