Heptad
n. 七个, 成七的一组, 七价原子\\n[化] 七价物; 七价的
🗣️ 情景例句
I don't usually listen to the weather. They never get it right!
我不怎么听天气预报。他们总报不准。
If things were to be done twice all would be wise.
事事倘能做两次，人人都可称明智。
There is no social problem it is more incumbent upon us to understand than this of the role of custom.
而没有任何一个社会问题比得上风俗的作用问题更要求我们对它理解。