在处理民事法律溯及力问题时，必须考虑司法判决的既判力和整个的民事法律体系。
When we deal with the retroactivity of the civil law, we should also consider the res judicata of the judicial decision and the integrity of the whole legal system.
法律解释的溯及力是指新的法律解释颁布后对其颁布前的事件和行为是否适用的问题。
The retroactivity of construction of law refers to if the new construction of law can apply to the past event and behaviour.
但法律是否具有溯及力应由法律本身作出明确规定，不能由司法解释来决定。
However, it is actually the law itself, not the PSC's interpretation, has the authority to specify the retroactivity of the law.
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