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
You made a tough decision.
你做了一个困难的决定。
All cats love fish but fear to wet their paws.
猫都爱吃鱼，却怕爪弄湿。
Neither of us spoke during the journey.
旅途中我们谁也没讲话。