Septavalent
a. [化]七价的
🗣️ 情景例句
I've been trying
我一直努力
I know the boy whose father is a pilot.
我知道那个男孩的父亲是飞行员。
'It's all right,' she said, 'but isn't it upside down?'
是不错，她说到，但你不觉得有些混乱吗？