【求助】关于Ref pattern得使用

用这种ref pattern得具体步骤是什么？
我首先选择需要复制得部件，出现了dim pattern 和Ref pattern
两种选项，然后直接选done,就可以了吗？
我看教学录像上是这么完成得，而我怎么试，信息上说pattern完成了，
可是看不到效果：（
希望大侠指教。

To me there are mainly 2 type :
  
1) simple type as in book, create a pattern with datum reference, then create some feature letssay feature 2 on the "leading feature" that is the original one which u had pattern, to let the feature 2 follow feature 1, right click and press ref pattern.
  
2) use surface transform / copy pattern . Create feature 1, then copy the feature using either "surface transform" + Move/rotate OR "copy feature" + Move/rotate. Then pattern it . After that create feature 2, lets say round on feature 1 on the feature that you had copy, then right click "ref pattern" and all pattern will had feature 2 on it .

使用ref pattern的前提是有可ref的阵列全在，
比如安装螺钉时如果螺钉孔是pattern出来的，
就能直接用ref pattern,操作很简单。
若没有可ref的阵列全在，该项变灰不可用。

哦，这样呀，我的孔不是pattern出来的，呵呵，那就不可以了。
我说怎么教学录像里面的可以，而我点了半天也没作用呢！
十分感谢！