他们用数学方法计算了达尔文所声称的进化机制需要多长时间才能完成某项特定的功能性转变。
They’ve done the math to calculate how long it would take for Darwin’s mechanism to accomplish a particular kind of functional conversion.
此程序没有内置的编程功能，旨在用作简单的符号数学计算器。
This program has no programming capability built in and is intended to be used as a simple symbolic math calculator.
对于大多数Shell，人们经常提到的局限性之一在于，它们具有松散的变量类型、没有数据数组支持、没有用于执行基本的数学或表达式计算的内置功能。
One of the commonly quoted limitations of most shells is that they have loose variable typing, no support for arrays of data, and no built-in functionality to perform basic math or expressions.
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