Quadrivalents
(quadrivalent 的复数) a. 四价的\\n[医] 四价的
🗣️ 情景例句
Listen up.
听着。
Want of care does us more damage than want of knowledge.
粗心比无知更为有害。
It is fairly clear that sleeping period must have some function,
很清楚，睡眠必然具有某种作用。