1、the extended two-dimensional outer boundary of a three-dimensional object
三維物體外層的擴展的二維的界限。

2、Related to, located in, or constituting an outer boundary or periphery.
周緣的關(guān)于、位于或組成外部邊界或周緣的

3、the extended two-dimensional outer boundary of a three-dimensional object.
三維物體外層的擴展的二維的界限。