https://www.youtube.com/watch?v=0QT1GNMevfc
1. 可以同時選：
Select Mode Header Widgets
In Edit mode there are three different selection modes. You can enter the different modes by selecting one of the three buttons in the toolbar.
Using the buttons you can also use more than one selection mode at a time by ⇧ ShiftLMB 
clicking the buttons.
clicking the buttons.- Vertices
- Selected vertices are drawn in orange, unselected vertices in black, and the active or last selected vertex in white.
- Edges
- In this mode the vertices are not drawn. Instead the selected edges are drawn in orange, unselected edges black, and the active or last selected edge in white.
- Faces
- In this mode the faces are drawn with a selection point in the middle which is used for selecting a face. Selected faces and their selection point are drawn in orange, unselected faces are drawn in black, and the active or last selected face is highlighted in white.
2.
