Les
abbr. 发射脱离系统（Launch Escape System）
🗣️ 情景例句
All right. Please hold two orchestra seats for us.
好，请帮我们保留两张前排的座位。
Will you speak up, please?
请你大声一点好吗？
He inspected the car for defects.
他详细检查车子有无效障。