mutual promises
mutual promises 相互允诺 指双方当事人同时向对方作出允诺，每一允诺都是对方允诺的对价。如果一个允诺可撤销，它仍是一个对价；如果该允诺无效，则它不是一个对价，合同也因此不能成立。
mutual promises
mutual promises
Promises given simultaneously by two parties, each promise serving as consideration for the other. See bilateral contract under CONTRACT.