three-fold中文什么意思

三倍的

• three fold axis:    三次轴
• three fold block:    三轮滑车三饼滑车
• three fold purchase:    绞辘绞辘

例句与用法

1. a molecule cannot have a three-fold axis and a four-fold axis in the same direction .
   一个分子不能在同一方向上有一个三重轴和一个四重轴。