Rcs
abbr. 雷达横截面（Radar Cross-Section）；皇家外科医生协会（Royal College of Surgeons）
🗣️ 情景例句
What?
什么？
A fall into the pit, a gain in your wit.
吃一堑，长一智。
One wants to meet like-minded collectors, to get advice, to compare notes, to exchange articles, to show off the latest find.
收藏者要会见情趣相投的收藏者，以获取教益，交流经验、交换收藏品，炫耀自己的最新收藏。