Septavalency
(=septavalence)[化]七价
🗣️ 情景例句
They're very kind to the animals.
他们照料动物很细心的。
When you go to buy, use your eyes not your ears.
你去购买东西时，要用眼睛莫用耳。
Good morning, class.
同学们，早上好。