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。
The effect of a civil legal act is the binding force of the doer's declaration of will, which is guaranteed by national power.
当代理人超越代理权限从事民事法律行为时，根据合同法的规定，此类合同是效力未定。
When agent surpass the power of attorney to enact civil juristic act, the effect of Contract is uncertain.
应用推荐