However, there is different knowledge about the effect of presumption of causality on allocation of burden of proof in the theoretic and practical field.
然而，理论界和实务界对于这种推定因果关系在证明责任分配上的效力，却存在不同的认识。
Nonlinear distortion of images by digital camera is made of combined errors of lens in the camera. It is confirmed through theoretic analysis and experimental proof.
通过理论分析和实验验证，在数码相机成像中，二维图像中的非线性畸变主要来自于相机镜头中透镜的组合误差。
Since TOPVENT2 SYSTEM marched into China market only few years, there are many engineering examples, but no matter design method or ventilation effectiveness is lack of theoretic proof.
但是，由于进入中国的时间较短，尽管已有不少应用实例，无风管诱导通风系统不论在设计方法还是通风效果上，都缺乏相关的理论验证。
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