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。
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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