The phrase "primary difference lies" is correct and usable in written English.
It can be used when discussing the main distinction between two or more subjects.
Example: "The primary difference lies in the methodology used for data collection."
Alternatives: "main difference is" or "key distinction is".
The primary differences lie in their storage interval and their respective physical environments: storage in either a liquid or a solid/frozen state.
The main difference lies between non neoplastic and neoplastic lesions.
The primary host difference lies between wild birds and domestic birds which live in completely different ecosystems.
The primary difference appears to lie in the compounds involved in the clotting process; although modest discrepancies in the relative distribution of some compounds between these pools have also been reported [18] The clotting of blood maximally stimulates blood cell eicosanoid biosynthesis, and thus serum levels of these metabolites do not reflect physiological concentrations [19].
Herein lies the primary difference between previous studies in rats and the current study in mice.
The primary difference between inkjet and laser printers lies in the process.
A primary difference between open and closed systems lies in the management of their centrosome activities.
A number of authors [e.g. 3], [20] have hypothesised that the primary difference among cold tolerance strategies in insects lies in ice nucleation.
"The company did not elaborate which hardware differences forced the changes, but the primary difference in the two versions of the iPhone lie in the radios (GSM vs. CDMA) and perhaps the GPS chipset," Kendrick writes.
For the primary outcome of NDI, there is consensus that a minimal clinically importance difference lies in the range of 3 5 percentage points, with a standard deviation of about 8%[ 8].
