convective derivative substantial derivative
date of substantial completion
dual wavelength substantial amount ratio method
Manually substantial space
Substantial
大
物
相当
实
物质的
实质性东西
真正的
基本上的
相当大的
具体的
坚固的
充实
substantial derivative：convective derivative
substantial devaluation
substantial equilibrium
substantial equivalence
substantial repair work
substantial equivilence