视频对白：
I took sevice elevator.
我乘了员工电梯。
Oh， you don't have to do that.
哦，你真没必要这样。
Vanya's on duty.
Vanya 上班呢。
I'm sure he'd love to seeyou.
他肯定很想见到你。

今天要学习的词组为：on duty

意为：“值班，上班； 因公”。

例句：
1. The nurse on duty was fearful that the patient should get worse.
值班的护士担心病人的病情会恶化。

2. The officers on duty were visibly overcome, many of them in tears.
那些值班的官员明显不能自持，许多人都流出了眼泪。

3. A policeman must not smoke while he is on duty.
警察当班值勤时不得抽烟。