Ditactic
短臂交叉的, 构型的双中心规整性
🗣️ 情景例句
Come on!
过来！
That is not good language which all understand not.
不是人人都懂的语言不是好语言。
The geologist needs to know what rocks the drill has reached,
地质学家需要知道钻头已经到达什么样的岩层，