宣告合同无效
in cases where the buyer has paid the price, the seller loses the right to declare the contract avoided unless he does so:
如果买方已支付价款,卖方就丧失宣告合同无效的权利,除非:
to declare the contract avoided
in cases where the seller has delivered the goods, the buyer loses the right to declare the contract avoided unless he does so:
如果卖方已交付货物,买方就丧失宣告合同无效的权利,除非:
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