1·She's ready to learn simple addition and subtraction.
她准备学习简单的加法和减法。
—— 《柯林斯英汉双解大词典》
2·We can use the magic of subtraction.
我们可以利用减法的魔力。
3·This service is a simple math calculation service, providing addition and subtraction operations.
该服务是一个简单的数学计算服务，提供了加法和减法运算。
4·Most of these are probably self-explanatory, like addition, subtraction, multiplication and division.
其中大多数可能都是不言自明的，比如加法、减法、乘法和除法。
5·Some of this work's been done at Yale in Karen Wynn's lab, where they look at babies' understanding of addition and subtraction.
其中一些研究是在耶鲁大学的凯伦·韦恩实验室完成的，他们在那里观察婴儿对加法和减法的理解。
1·Digital subtraction angiography (DSA) is an important technology in both medical diagnoses and interposal therapy, which application is very universal.
数字减影血管造影(DSA)是一种在医学诊断和介入治疗中起重要作用的技术，应用十分广泛。
2·The quality of the subtraction image was improved and computation time was reduced by selecting edge pixels as triangular control points.
通过计算图像梯度信息，选取边缘区域像素作为控制点，既改善减影图像质量，又提高运算速度。
3·Blood supply reestablishment of avascular necrosis of femoral head with digital subtraction angiography.
股骨头坏死血供重建的数字减影血管造影研究。
4·Objective To investigate the value of digital subtraction angiography (DSA) in diagnosis and treatment of ischemic cerebrovascular disease.
目的探讨数字减影血管造影(DSA)在缺血性脑血管病检查及治疗中的价值。
5·Objective To explore the value of three dimensional(3D) digital subtraction angiography(DSA) in treatment of intracranial aneurysm.
目的探讨三维（3D）数字减影血管造影（DSA）在颅内动脉瘤治疗中的价值。