标注的组成部分

Dimensions are made up of many different objects, such as lines, text, solid fills and blocks. While each dimension type might appear slightly different from one and another, they do have several parts in common.

标注是由许多不同的对象组成的，像直线、文字、实体填充和块。虽然每个标注类型都有可能会出现些微的不同，但是他们都会有几个共同的部分。

Dimension line. A line that indicates the direction and extent of a dimension. For an angular dimension, the dimension line is an arc.
尺寸线。指示标注的方向和范围的线。对于角度标注，尺寸线是圆弧。
Extension line. A line in which extends from the feature being dimensioned to the dimension line. Extension lines are also refered to as projection lines or witness lines.
尺寸界线. 尺寸界线从被标注的特征上延长至尺寸线。尺寸界线也称为投影线或证示线。
Arrowhead. A symbol that is used to indicate the ends of the dimension line. Arrowheads are also refered to as symbols of termination or just termination.
箭头。 常常用于指示尺寸线终止的符号。箭头也称为终止符号或终止。
Dimension text. A text string that usually indicates the actual measurement of the distance or andle being measured. The text may also include prefixes, suffixes, and tolerances.
标注文字。 它通常指示距离的实际测量值的文本字符串，它也可能会包含前缀、后缀和公差。
Leader. A solid line leading from some annotation to the referenced feature.
引线。 引线是将注释连接到其参照的特征的实线。

Center mark. A small cross that marks the center of a circle or arc.
圆心标记。 是用于标记圆或圆弧的圆心的小十字线。
Centerline. A set of broken lines that mark the center of a circle or arc.
中心线。 标记圆或圆弧的圆心的打断线。

For more information about the parts of a dimension, see “Parts of a Dimension”in the AutoCAD User's Guide.

更多关于标注的组成部分的详细信息，请参见《AutoCAD 用户手册》中的“标注的组成部分“。