Synallagmatic
a. [律](条约或合同)双务的,对双方具有约束力的
🗣️ 情景例句
Come on! You'll hear about it.
来吧， 来听听。
Is it convenient to you if I come at 6 p.m.?
如果我下午6点来拜访你，方便吗？
No, I'm not. Good! I can reach them now. Catch!
不，不高。好！现在我够得着了。接住！