what's the most famous idioms about learning or behaving in your country

China
January 2, 2009 7:41am CST
There had different idioms to guide young man in different country,I thought that was all very useful.But it's hardly to met unfortunately.Have you ever heard it widely used by foreign country? let me begin it:'one of them can be a teacher to the other two when three person walking together' can you guess what's it meaning? let's exchange it and please leave it if you had.
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