看文中的描述，觉得意思是如果技能受训，就可以在得到职业辅助威能的时候选择skill power，如果选择skill power专长则可以额外得到一个威能。
但是据调查官方character builder选择skill power feat之后啥都不会多。疑惑不解，拿到这里来看看各位的意见。
以下为规则原文
GAINING AND USING A SKILL POWER
You can gain and usc only the skill powers associated with your trained skills. Whenever you reach a level that grants you a utility power from your class, you can choose a skill power in place ofa class power. The
skill power you choose must be of the same level as or lower in level than the class power you would have gained.
You can use retraining (Player's Handbook, page 28) to replace a class power with a skill power and vice versa, as long as the new power is of the same level as or lower in level than the replaced power.
You cannot replace a utility power from a paragon path or an epic destiny with a skill power.
SKILL POWER
Prerequisite: 2nd level
Benefit: You gain a skill power ofyour level or lower from a skill in which you are trained.
