Rcl
abbr. runway center line （机场）跑道中心线
🗣️ 情景例句
What grade are you in?
你在几年级？
It is easier to give good counsel than to follow it.
提出忠告易，照著办事难。
That's a big box. Is it heavy? Please let me help you.
这是个大盒子。重吗？让我来帮你。