这个引用必须存在于测试中并且在条件块前。

The reference must exist in the test and precede the conditional block.

youdao

大多数情况下，一个条件块依靠一个引用的值发出用户输入动作。

In most cases, a conditional block issues user input actions depending on the value of a reference.

youdao

无需回头使用显式的(和冗长的)条件块，而是用规则定义自动处理问题。

Rather than revert back to explicit (and lengthy) conditional blocks, the rule definitions take care of matters automatically.

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