Pnr
abbr. point of no return 不可返回点（不能用自带燃料返回基地的航线临界点），安全返航点; prior notice required 需要预先通知
🗣️ 情景例句
That's it.
就这样。
Man is the artificer of his own happiness.
人之幸福，自己创造。
He did not look up from his desk when I entered.
我进去的时候，他连头也没抬。