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你唯一的限制是你给自己设定的那些。
The Eskimos had fifty-two names for snow because it was important to them: there ought to be as many for love.
Over the centuries the Indians developed sign language for communicating phenomena of interest. Programmers from different tribes (FORTRAN, LISP, ALGOL, SNOBOL, etc.) could use one that doesn't require them to carry a blackboard on their ponies.