損害 損害賠償 全數賠償 全數賠償或根本不負賠償責任原則 酌減條款 酌減賠償數額 民法第二百十八條 荷蘭民法 瑞士債務法 歐洲侵權行為法原則 歐洲契約法法典草案 賠償義務人之生存能力 衡平事由 Damage Compensation Full compensation All or nothing principle Reduction clause Mitigation of compensation Reduction of damages Art. 218 civil code of Taiwan The swiss code of obligations The dutch civil code Principles of European tort law Draft of the European contract code Existence ability of the debtors Equitable circumstances