AP News:国务卿迈克·庞培访问沙特阿拉伯

1.Up to 3 suspects were at large.

at large未被捕的
As the murderer was at large, people were afraid to go out.
因为杀人犯尚未被逮到，人们很怕出门。

2.The school district has hired hundreds of substitutes and plans to keep schools open.

substitute替代者

She is seeking a substitute for the very man whose departure made her cry.
他在寻找一个男人的替代者，这个男人的离去曾使她伤心落泪。