下句（见补充说明）的从句部分是什么语法结构?The reflection principles apply even when surfaces are curved as long as the curvature of the surface is smooth,that is,as long as there is a plane tangent to the surface at the point of
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下句（见补充说明）的从句部分是什么语法结构?The reflection principles apply even when surfaces are curved as long as the curvature of the surface is smooth,that is,as long as there is a plane tangent to the surface at the point of
下句（见补充说明）的从句部分是什么语法结构?
The reflection principles apply even when surfaces are curved as long as the curvature of the surface is smooth,that is,as long as there is a plane tangent to the surface at the point of contact.
【译句：即使（反射）面是弯曲的（曲面）,只要面的弯曲部分是光滑的,亦即只要存在一个平面在反射点处与此曲面相切,反射定律也可适用.】
注：此句的中文意思我能理解,但不知从语法角度怎么分析?其中的那个that引导主语从句吗?
下句（见补充说明）的从句部分是什么语法结构?The reflection principles apply even when surfaces are curved as long as the curvature of the surface is smooth,that is,as long as there is a plane tangent to the surface at the point of
that is,:在这个句子中是插入语,用来连接后面的并列句.类似于：or