In digital signal technique, a signal that uses a positive(or negative) excursion and ground as the two binary signal states.
在数字信号技术中, 用正(或负)向电压与地两个电平来表示二进制“1”和“0”的一种信号
I was roped in for this excursion before I knew it.
我不知不觉被拉来参加了这次远足旅行。
The excursion was the high spot of our holiday.
我们那个假日的最大乐趣是远足。