* 获取数字的第digit位（从右往左，0表示个位）
Interaction — Draggable, Hoverable, Clickable mobjects
，这一点在同城约会中也有详细论述
Раскрыты подробности похищения ребенка в Смоленске09:27
stroke_texture: “visible pencil grain”
It contains six teeth and has a number stamped on the inside.