核心词议：
n. 减法；减去
subtraction 基本解释
n. 减，减法；减除法；减去
速记方法
速记技巧 词根词缀法 sub-下+-tract-拉+-ion→拉下去→减去
知识扩展
中文词源
中文词源： subtraction
精选例句
1、 She's ready to learn simple addition and subtraction.
她准备学习简单的加法和减法。
常见考点例句：
- They were better at arithmetic , including tasks like simple subtraction and complex multiplication .
- 她们更擅长算术，包括简单减法和复杂乘法。
- Help your child learn division , multiplication , subtraction and addition by teaching her about the different denominations of money .
- 通过钱不同的面值教导他，帮助孩子学到乘、除、减和加法的不同运算方法。
- But some operations ( including subtraction and division ) care about order , so the symmetrical foldright method exists to handle those cases .
- 但某些操作（包括减法和除法）就很在意顺序，所以要存在一个对称的foldright方法来处理这些情况。
- According to discovery , dolphins are able to do complex , nonlinear math that involves addition , subtraction , multiplication and ratio comparisons .
- 据探索频道报道，海豚能够做复杂的非线性数学运算，包括加法，减法，乘法和比例比较等。
- To get through stressful homework sessions , she used blocks for addition and subtraction " so he could touch every one . "
- 为了应付紧张的家庭作业，她用木块来帮助儿子做加法和减法，“这样他就可以触摸到每一个木块。”
