Pentavalency
五价
🗣️ 情景例句
When's the last time you took a vacation?
上次你去度假是什么时候？
Having this new branch means a great deal to the economy of both countries.
这家分行的建立将对两国的经济交流起到很大的作用。
That rings a bell.
我总算想起来了。