In case of temporary impossibility, man should take the way of fictional time to recognize the right of rescission and the claim for damages of creditor, and not take the rule of undue hardship.

• 在一时不能的情形，应当采取拟制期间的做法来认定债权人的解除权和损害赔偿请求权，而不采取不可苛求性之规则。