Reciprocative
a. reciprocate（互给；互换）的变形
🗣️ 情景例句
Are you sending it by regular or by speed?
你要寄平信还是快递？
What? I'm right, aren't I?
怎样？我没说错吧！
Even if a piped water supply is safe at its source,
既使管道供水系统在水源处是安全的，