Will research or firing a skill in a certain location be part of the tech tree enabling, for example Stim Packs could be researched to enable a Factory?
研究或者升级一种技能可以在的某个特定位置激活科技树吗？举个例子，研究兴奋剂用来激活兵工厂？
Finally, if the tree node is ConnectionFactoryInfo, the children of this node will be connection properties defined for the corresponding connection factory.
最后，如果树节点是ConnectionFactoryInfo，那么该节点的子节点将是为相应的连接工厂定义的连接属性。
Since 1976, we have determined the purification effects of air pollution by three structures, namely, forest-belt, hedgerow and scattered tree planted in Shaoxing Iron and Steel Factory.
自1976年以来，我们对绍兴钢铁厂设置的林带、绿篱、散生树三种结构的空气净化效应进行了测定研究。
Since 1976, we have determined the purification effects of air pollution by three structures, namely, forest-belt, hedgerow and scattered tree planted in Shaoxing Iron and Steel Factory.
自1976年以来，我们对绍兴钢铁厂设置的林带、绿篱、散生树三种结构的空气净化效应进行了测定研究。
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