出卖人与先买权人二者的权利义务一致，才能平等保护双方利益。
Only if the saler and the buyer's right and duty combined do they could be protected at equal.
对于保留所有权的买卖，亦无例外，只不过是出卖人移转所有权的义务被附加了条件。
Although no exception occurs for all transactions including transaction of ownership reservation, conditions are added to seller's obligation of ownership transference.
第一百五十一条买受人订立合同时知道或者应当知道第三人对买卖的标的物享有权利的，出卖人不承担本法第一百五十条规定的义务。
The seller is obligated to warrant that the buyer will be free from any third party claim against it in respect of the subject matter delivered, except otherwise provided by law.
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