Quadricovalent
四配价的
🗣️ 情景例句
A generation raised on junk food could turn out mentally vulnerable.
在零食中长大的一代人，注定精神脆弱。
How much is a call to the United states?
打一个电话到美国去需要多少钱？
Lucy ran faster than Meimei.
露茜比梅梅跑得更快。