  According to the nonuniqueness principle, the homogeneous scalar field
Lagrangian can be expressed in various forms both standard and nonstandard
ones. Therefore, the standard and all possible nonstandard Lagrangians can be
linearly combined while the Klein-Gordon equation is still intact. This linear
combination of Lagrangians is used to demonstrate that the energy density of
homogeneous phantom field can possibly be bounded from below. The applications
of this new Lagrangian in the nature of the ghost condensate and the equation
of state with $w<-1$ are discussed.
