If you did, the book refers to the holy grail thousands of times. Originally, the Holy Grail was the dish, plate, or cup used by Jesus at the Last Supper, said to possess miraculous powers (For more detail see http://en.wikipedia.org/wiki/Holy_Grail).
What it meant in your teacher's comment depends on the context. Generally speaking, it's okay to say holy grail 延伸意义是终极目标或 top prize 的意思.
Ever read Da Vinci Code?
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a。。这么多故事,只是下课的时候他跟我说了句:this is good.
-wistara-
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04/09/2009 postreply
11:16:44
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I remember...
-carpediem-
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04/10/2009 postreply
10:02:36
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ok, thanks. i'll go talk to him next week.
-wistara-
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04/10/2009 postreply
11:58:10