英语中，propositionproposalsuggestion三词意思有何不同

proposition 主张 议案 He made an attractive business proposition.Her theory rejects the basic proposition that humans evolved from apes.proposal 建议提案（比较正式的，生意上的）They put forth a proposal to sell the company.suggestion建议（一般指非正式的）I have a suggestion: call the store and ask them about it.