Backjoint
n. 石阶踏步背榫; 留槽待填
🗣️ 情景例句
It was an extremely difficult and dangerous task.
这是一项极度困难的危险的工作。
You're so retarded!
你很迟钝呐！
Vera's curious talent was brought to the notice of a scientific research institute in the town of Ulyanovsk, near where she lives,
维拉的特异功能引起了她家附近乌里扬诺夫斯克城一个科研单位的注意。