为了让规则返回effect的值，关联条件必须返回True。
To have the rule return the value of the effect, the associated condition must return True.
以犁煤器为控制对象，通过找出影响其抬起和落下的关联条件，设计出了通用的PL C功能块。
Taking coal plough as control object and finding association condition influencing on lifting and falling of coal plough, it designed general PLC function block.
恶劣的住房条件、负债以及贫困是相互关联的。
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