判断循环条件的真假。
接下来，考虑无限循环语句和条件。
Next, we consider the infinite loop statement and conditionals.
While循环活动包含其他活动和一个条件。
A while loop activity contains other activities and a condition.
当条件为true 时，将执行循环中的步骤。
While the condition is true, the steps in the loop are performed.
只要 preg_replace()找到匹配，循环就必须继续，这解释了 $old ! = $pretty_print条件。
As long as preg_replace() finds a match, the loop must continue, which explains the condition $old != $pretty_print.
然而，在主循环中，您使用了一个条件分支。
您已经了解了如何使用for 循环；现在，我们来讨论条件语句。
You already know how to use a for loop. Now let's talk about conditionals.
切换实例是一个循环或条件构造吗？
得出在给定条件下循环周期的极限。
在不使用循环边界条件情况下，求解出一维原子链的振动解析解。
We get the lattice wave solution of monatomic chain under the free boundary condition.
本文研究了溶液循环流动法生长大截面KDP晶体的工艺条件。
The growth of large KDP crystals is studied by solution circulating method.
获取或设置作为循环继续的条件进行测试的表达式。
Gets or sets the expression to test as the condition that continues the loop.
如果条件为真，执行循环体，然后再调回到第一步。
If the condition is true, run the body and then go back to step 1.
如果条件为真，执行循环体，然后再调回到第一步。
If the condition is true, run the body and then go back to step 1.
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