締結法律行為過失 締結法律行為責任 締約過失 締約責任 損害賠償 回復原狀 法律行為不成立 法律行為無效 表現法律行為 體系解釋 限縮解釋 類推適用 Doctrine of promissory estoppel in legal act-making Liability of faults during the process of conclusion of contract Damages Restore to the status quo ante Restitution Rehabiliation Non-constituted legal act Invalid legal act Ostensible legal act Systematic construction Restrained interpretation To meet the legislator intent Applied by analogy