How do you spell "公开课"in English?

How do you spell "公开课"in English? do ,how,spell ,english ,that ,in,you(?)连词成句 how do/can you spell english How do you spell the word （ ）English 介词 How do you spell "English"?(做回答） How do you spell it?还有What's this/that in English?和it's an o how do you spell it how do you spell that how do you spell "quilt" how do you spell that? how do you spell it? How do you spell it,