R.c.
abbr. (=reinforced concrete)【建】钢筋混凝土\\n
🗣️ 情景例句
I don't know how to drive I'm afraid.
恐怕我不懂得怎样开车。
I am sorry you feel sad.
抱歉，让你伤心了。
I'm sorry, I don't know. You'd better ask that policeman.
对不起，我不知道。你最好问问那位警察。