1. When do we use multiplication and division? 什么时候我们用乘法和除法？
2. As you might guess, Arithmetic operations are the fundamental math operations : addition , subtraction , multiplication , and division. 正如您所猜测的，算术运算是基本的数学操作：加法、减法、乘法和除法。
3. Explants are also a means of plant propagation, producing clones and offering a more rapid means of multiplication than seed production. 组织培养也是一种植物繁殖方式，它产生克隆，提供一种比种子发芽更为快速的增殖方法。
英英解释
n.
1. an arithmetic operation that is the inverse of division; the product of two numbers is computed
2. the act of producing offspring or multiplying by such production
3. a multiplicative increase
