人世间，凡事首先得有“门”。有“门”才有“道”，没“门”可能就真的“没门”了。当然，这“门”多半指的是“空门”。如“找窍门”、“拍脑门”、“走后门”、“摸不着门”等等。似乎真的有个“门”，可能根本就“没门”。但也有些地方，似乎根本就没“门”，可偏偏就... In the world, everything must first have a “door.” There are “doors” to have “courses”, no “doors” may be really “no doors”. Of course, this “door” mostly refers to the “empty door.” Such as “find yamen”, “pain the brain”, “go back door”, “touch the door” and so on. It seems that there really is a “gate” that may simply “no way”. But in some places, it seems that there is no “door” at all;