1. 提议；建议；提案
    A proposal is a plan or an idea, often a formal or written one, which is suggested for people to think about and decide upon.

    e.g. The President is to put forward new proposals for resolving the country's constitutional crisis...
           总统将提出解决国家宪法危机的新议案。
    e.g. ...the government's proposals to abolish free health care...
           政府关于废除免费医疗保健的提案

2. 求婚
    A proposal is the act of asking someone to marry you.

    e.g. After a three-weekend courtship, Pamela accepted Randolph's proposal of marriage.
           经过3个周末的追求之后，帕梅拉接受了伦道夫的求婚。