Life is but a span, we should leam to do subtraction.
人生苦短，我们要学会做减法。
I've got one test there, and then I've just got one thing to do here, which has got a subtraction and a multiplication.
我在这里做了一个测试，然后我在这里做了一件事，就是做减法和乘法。
Instead symbols like + or * are used to define functions that can do things like normal numerical addition and subtraction.
相反，使用 +或 *等符号定义可以执行普通数字加减法的函数。
The little boy can already do simple problems in addition and subtraction.
这个小不点孩子都已经会做简单的加减法问题了。
The danger: students who can not even do simple addition and subtraction.
很危险的是，一些先生甚至连复杂的加减法都不会做。
When do we use subtraction for current accounts?
在往来帐户中什么时候要用减法呢？
Same sort of subtraction problem, what do we have for the ionization energy of the 2 s electron?
进行类似的减法运算，得到的，2,s，电子的电离能应该是多大呢？
We do addition and subtraction in arithmetic.
在算术里，我们作加减运算。
We do addition and subtraction in arithmetic.
在算术里，我们作加减运算。
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