Pentavalency
五价
🗣️ 情景例句
There are a lot of beggars on the street, how can we help them?
街上的乞丐那么多，我们怎么能帮助他们呢？
Would you like to leave your name and number?
你想要留下你的名字和电话吗？
The fire brigade was called and two fire fighter freed George using a special type of grease.
有人打电话叫来消防队，两位消防队员使用了一种特殊的润滑剂才使乔治得以解脱。