Pentavalency
五价
🗣️ 情景例句
He's planning a get-together
他计划办一个聚会
Let us imagine a hypothetical case where we disagree.
让我们假设一个我们不同意的状况。
There's no need for that. We'll have dinner another time.
不必为那件事惭愧。我们改个时间再共进晚餐吧。