The difference between the/bin/sbin/usr/bin/usr/sbin/usr/local/bin/usr/local/sbin directories in a Linux system

First, a paragraph of English:

/bin This directory contains executable programswhichis neededinchSingle user mode and to bring the sys‐tem up or repair it./Sbin like/bin, this directory holds commands needed to boot of the system, butwhichIs usually not executed by normal users./usr/Bin this is the primary directory forExecutable programs. Most programs executed by normal userswhichis not needed forBooting or forRepairing the system andwhichis not installed locally should is placedinchThis directory./usr/sbin This directory contains program binaries forSystem administrationwhichis not essential forThe boot process, forMOUNTING/USR, or forsystem repair./usr/local/bin Binaries forprograms local to the site./usr/local/sbin locally installed programs forSystem administration.

Do not understand, no matter, to a Chinese version of:

/bin  Store all user-available system programs, system startup or system repair available (can be used without mounting/usr directory)
/sbin System programs that store super users
/usr/bin store applications available to all users

/usr/local/bin Storage of Local machine-independent programs available to all users

/usr/local/sbin a local machine-independent program for super users to use

Funny version:

originally these directories are together, later until one day: the UNIX developer's hard disk is not enough, the new add a piece, hung on /usr, and TM is not enough, add a piece, hang on /usr/local; somehow, It becomes the norm .... 

The difference between the/bin/sbin/usr/bin/usr/sbin/usr/local/bin/usr/local/sbin directories in a Linux system