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'm glad for the dog.
我真替那只狗高兴。
The dinner was wonderful.
晚餐棒极了。
Workers will have completed the new roads by the end of this year.
工人们将在今年年底前把新路铺好；