add subtract

英 美
  • 加减
  • add v.加;增加;补充
  • subtract vt.减去vi.减少
    1. Children should be able to add and substract in the third grade.
      儿童应该在三年级的时候能够进行加减运算。
    2. The idea that a machine could be built to add and subtract was an early step.
      制造一种能进行加减运算的机器的设想是历史的第一步。