Backs
n. 后背, 脊背；后卫（back的复数形式）
🗣️ 情景例句
Amtrak is happy to announce our arrival in New York City.
我们很高兴报告诸位 Amtrak火车就要到达纽约了。
Excuse me I couldn't help you.
对不起我不能帮助你。
Later we learnt that there was a very important person on board.
后来我们才得知，飞机上坐了一位非常重要的人物。