s. being and remaining ready and available for use
n. 等候a. 等候的, 服侍的
1. I am waiting for the bus to arrive.
我在等公交车到达。
2. She is waiting for her friend to call.
她在等她的朋友打电话。
3. We spent hours waiting in line for the concert tickets.
我们花了几个小时在排队买音乐会门票。