the space left between the margin and the start of an indented line
同义词：indentation, indent, indenture
indention详细解释
in.den.tion n.（名词） The act of indenting.切割成锯齿状的行为The condition of being indented.呈犬牙交错的状态Printing The blank space between a margin and the beginning of an indented line.【印刷术】 行首空格：白边与缩进行行首之间的空白处Archaic An indentation or a dent.【古语】 锯齿状缺口或凹痕
