Quadrivalence
n. 四价\\n[医] 四价
🗣️ 情景例句
The office seems so far away.
办公室好像变得那么遥远。
I'm easy to please.
我很容易相处。
The village seemed deserted, the only sign of life being an ugly-looking black goat on a short length of rope tied to a tree in a field nearby.
村里似乎无人居住，唯一的生命迹象是附近田里一只面目可憎的黑山羊，用一截短绳拴在一棵树上。