• 1. number line: 数轴 | 数线 | 规定了原点
• 2. Extended real number line: 扩展的实数轴
• 3. mental number line: 心理数字线 | 心理数轴 | 心理数线

更多释义

• 1.Diagram 5 shows an incomplete number line.
  图5显示一条不完整的数目线。
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• 2.The integers divide the number line into infinitely many half-open intervals.
  整数把数轴分成无穷多个半开区间。
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• 3.For example a teacher might use a number line to help a child understand the difference between larger and smaller Numbers.
  举个例子，老师用一条数字线来帮助孩子理解大数和小数的区别。
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