initial substance造句

The initial substance now denotes a set.
To begin, low capital cost to produce energy because the water is an initial substance.
The spectrophotometer then converts the transmission ratio into'absorbency', the concentration of specific components of the test sample relative to the initial substance.
where } } is the constant number of particles throughout the decay process, which is equal to the initial number of nuclides since this is the initial substance.
It's difficult to find initial substance in a sentence. 用initial substance造句挺难的