求翻译：现有文献肯定了专利产出与经济增长的内在关系，但仍有两点不足：一是只将专利产出变量的当期值引入方程，却没有考虑滞后变量的影响。是什么意思？

Affirmed the patent output and economic growth in the intrinsic relationship to the existing literature, but there are still two shortcomings: First, only the current value of the patent output variables into the equation, but did not consider the impact of lagged variables.

正在翻译，请等待...

正在翻译，请等待...

Existing document affirmed the inherent relationship between patent output and economic growth, inadequate but there are still two points: first, only the introduction of patent output current of the variable value equation, but not lagging effect variables.

正在翻译，请等待...