如果时间许可，打算宣告合同无效的一方当事人必须向另一方当事人发出合理的通知，使他可以对履行义务提供充分保证。
If time allows, the party intending to declare the contract avoided must give reasonable notice to the other party in order to permit him to provide adequate assurance of his performance.
履行费用的负担不明确的，由履行义务的一方负担。
If the party responsible for the expenses of performance was not clearly provided, the obligor shall bear the expenses.
译文：如果时间允许，欲宣告合同无效的一方当事人必须向另一方当事人发出合理的通知，使其可以对履行义务提供充分保证。
If time allows, the party intending to declare the contract avoided must give reasonable notice to the other party in order to permit him to provide adequate assurance of his performance.
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