Punching in and out of work is common for employers to keep track of employee's attendance, but what if a wife uses that on her husband?
A card scanner is installed by a wife to make sure that her husband doesn't come home later than 9 pm. Otherwise, he'll need to face the music!
n. 小路,跑道,踪迹,轨道,乐曲
v. 跟踪