Fǎlǜ shàng, yāoyuē bìxū míngquè biǎodá dìnglì hétong de yìyuàn.
Legally, an offer must clearly express the intention to conclude a contract.
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要约 is a formal legal/business term. In ordinary conversation, 提议 or 建议 are used for 'proposal'. In contract law contexts, 要约 specifically means a binding offer that, if accepted, creates a contract.
