informal contract and formal contract
formal contract and informal contract 要式合同与不要式合 Informal Contract and Formal Contract 非要式契约与要式契约 the formal contract for signature 正式签订合同 ..
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informal contract and formal contract
非正式合同和正式合同
以上为机器翻译结果，长、整句建议使用 人工翻译 。