Umnyango womlilo wensimbi unokumelana nomlilo okuqinile, intengo emaphakathi, ukufakwa komsindo ophezulu kanye nokushisa ukushisa, futhi uqinile. Imikhiqizo yensimbi engashi isetshenziswa kakhulu ezakhiweni zezimboni kanye nezakhiwo zomphakathi ngenxa yesitayela sayo esiyisidina nokubukeka okungabukeki.