The phrase "two primary methods" is correct and usable in written English
You can use it to describe two main ways of accomplishing a task or two main approaches to a situation. For example: "We will discuss two primary methods of resolving this issue."
The content analysis of images is accomplished by two primary methods: image processing and pattern recognition.
Two primary methods are available for the measurement of polyacrylamide concentration in oilfield brines.
Check Point provides two primary methods for deploying NAT: Hide mode and Static mode.
The two primary methods currently used for atomic resolution simulations are Bloch wave calculations and the multislice method [18 20].
There are two primary methods for capturing information on LULC: analysis of remotely sensed imagery and filed survey.
Currently, there are two primary methods for trade on the GCC interconnection, which are scheduled exchanges and unscheduled exchange.
There are three primary methods for applying Azolla to crops.
There are three primary methods of terminating VPN tunnels in a DMZ: at the edge router, at the firewall, and at a dedicated appliance.
Recruitment was conducted through three primary methods: 1) Approaching women outside a county DTC in a moderately large upstate city in the state of New York; 2) Emailing via staff listserves; and 3) Snowball methods of staff contacting other staff who gave the team permission to email them.
To wit, we present a categorization based on how a SBIM application chooses to interpret a sketch, of which there are three primary methods: to create a 3D model, to add details to an existing model, or to deform and manipulate a model.
Three primary methods are used: Pre-combustion, post-combustion, and "oxyfuel".
