Do you know what is Swiss-cheese learning? 
Well, it is not about learning how to make Swiss cheese. It refers to the situation that someone barely stumbles through a course of study with a low grade such as D or C but without fully mastering the concepts. By the end of a series of such courses, there will be many "holes" in his knowledge, like Swiss cheese. According to a radio program I listened to on my way home today, this is a problem with a number of US students.
Surfer_Diver
2013.8.28
Learn a Phrase: Swiss-Cheese Learning
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                    I had never imagined myself a Swiss-cheese learner
                     -北京二號- 
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                        08/29/2013 postreply
                                                00:32:48
                    
                    
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                    想起我們的“一知半解”,跟這個是不是差不多?
                     -北京二號- 
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                        08/29/2013 postreply
                                                14:43:03
                    
                    
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                    Yes, I think so.
                     -衝浪潛水員- 
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                        08/29/2013 postreply
                                                19:35:27
                    
                    
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                    A good one. From learning to learner.
                     -衝浪潛水員- 
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                        08/29/2013 postreply
                                                19:19:18