walk in on
- come upon (a person or situation) suddenly or unexpectedly
The state of Hong Kong tried to walk on two legs in the 1970s. on one hand, it promoted export industrialization by building...
...輕快的 快樂的 得意的 洋洋得意Feel elated or exuberantly joyful, as in She was walking on air after she found out she'd won the teaching award. ...
通常我們都說 walking on the street 走在街上 in 是用在某個空間裡 比如說 in the room on 是說在...上面 所以說 Boys are playing on the street才對歐!