The phrase "a secondary zone" is correct and usable in written English.
It can be used in contexts where you are referring to an additional or less important area or category within a larger framework.
Example: "In the study of urban development, we must consider not only the primary zone of activity but also a secondary zone that may influence local dynamics."
Alternatives: "an auxiliary area" or "a subordinate zone".
But the plans include possible measures in a secondary zone extending 50 miles from the plant to protect against contaminated foods or water, Mr. Burnell said.
We studied a stable pilot flame system for a cannon type combustor of turbo-engines by adding both a frontchamber and a pilot flame chamber with an electric ignition system to the conventional two-stage system with two-stage combustion domains: a primary zone and a secondary zone.
But look away and sensory cues tell you you're entering a secondary zone where the narrative will pause.
Once the viewer firmly crosses the threshold into a secondary zone, the viewers can use joysticks to move around and explore their environment with the narrative paused.
This study has characterized the plane of division in a secondary zone of proliferation.
Most uniquely VRographers can divide scenes into passive viewing area where the primary action occurs, and an interactive secondary zone where looking will pause the narrative so you can explore at your own pace.
The extensive savanna woodlands in the semi arid central, western and southern parts of the country constitute a post fire secondary zone where the potential for forestry as a major productivity activity is high.
Diploid polyploid contact zones may occur in two ways, namely (i) a primary contact zone, arising from the emergence of a new ploidy level within a diploid population, and (ii) a secondary contact zone, formed following contact between diploid and polyploid populations that were geographically isolated and have probably differentiated in allopatry (Petit et al. 1999).
If the pollution spill does not create a secondary dead zone this year, it might increase the size of next summer's, Williams said.
But now, marine biologists are worried that sediment and other pollution that Lee washed into the water will give rise to a secondary dead zone.
Aluminide-coated Ni-based superalloys are prone to microstructural instabilities during long-term exposure at high temperature with the growth of a secondary reaction zone (SRZ) detrimental from a mechanical viewpoint.
