act without legal effect 无效法律行为 ; 无效
The effect of a civil legal act is the binding force of the doer's declaration of will, which is guaranteed by national power.
民事法律行为效力指当事人意思表示的约束力或拘束力，其约束力或拘束力的权威由国家强制力予以保障。
Act in accordance with universal legal principle to actualize the defense on legal procedure and form basic behavior rule when carrying tourism right into effect.
实施旅游权，要遵循法律的普适原则，要体现法律在程序上的各种保障，要形成基本的行为规范。
The origination and structure effect of legal act cover four main phases from Roma law to BGB. The theory of meaning expression is the basic of legal act system.
法律行为制度的源起自罗马法始至德国民法典确立经历了四个主要阶段。
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