例句：
The seat next to him was vacant.
他旁边的座位空着。
She had a kind of vacant look on her face.
在她脸上有一种茫然的表情。
At graduation the students presented each other with valedictory inscriptions.
毕业时同学们互相题词勉。
Rather, your valedictory address should leave former colleagues feeling a warm glow.
相反，你的`告别演说应该让以前的同事感受到温暖的光辉。