Backjoint
n. 石阶踏步背榫; 留槽待填
🗣️ 情景例句
to read to the students--their own children, really.
共同为学生们， 其实就是他们自己的孩子， 朗读
How many boxes are you going to use?
你要用几盒？
Your hand feels cold.
你的手摸起来很冷。。