运算很简单，但前提是记下代码，否则无法完整地在头脑中使用这种方法。

The math is pretty easy, but unless you memorize the codes, you won't be able to perform the entire technique in your head.

youdao

注意，在本例中，sum 必须被初始化为一个显式的浮点值；否则，所有后续计算都将使用整数运算计算。

Note that, in this example, sum must be initialized to an explicit floating-point value; otherwise, all the subsequent computations will be done using integer arithmetic.

youdao

地震时间剖面的数字偏移程序不但要有较好的偏移效果，还要求运算速度快，否则其应用要受到限制。

For the digital migration program of time section, it is required not only the better results but also the high speed of calculation, or its application will surely be restricted.

youdao