选出每味药的薄层层析各项条件。
上面所允许进行的焊接应符合下述各项条件。
Such welding shall be allowed under the following conditions.
类似地，在函数的末尾，如果您知道应该有某些后置条件，那就编写对应于各项条件的断言。
Similarly, at the end of the function, if you know that there are certain post-conditions that should hold, write assertions corresponding to each.
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