Quadricovalent
四配价的
🗣️ 情景例句
Fine. How much would you like to exchange, sir?
好的。您要兑换多少呢，先生？
I often have supper at night.
我常常在晚上吃晚餐。
On that day everyone eats mooncakes.
过节那天大家都吃月饼。