Rtn
abbr. retain 留住; return 返回; 回路; routine (flow chart) 常规（流程图）
🗣️ 情景例句
Excuse me, Mr. Carlson,
对不起 ，Carlson先生，
You look very serious about something.
你似乎有很严重的事。
Look at Mr Fat. He was very rich. He had lots of money.
瞧胖先生。他很富。他有很多钱。