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The phrase 'is approximately constant' is correct and usable in written English.
It can be used to describe a situation in which something remains essentially the same over a period of time. For example, "The number of people living in poverty in the city is approximately constant year to year."
Exact(60)
By approximating also by, (5) shows the following ratio is approximately constant: (17).
The corrosion rate is approximately constant in spite of increase of moisture content more than 40%.
Within one epoch, the average fitness in the population is approximately constant.
Aging is performed until the cycle-average NOx conversion measured at 400 °C is approximately constant.
Close to the center, cell density is approximately constant for d≤ 300 μm.
Equation 3 tells us that the angular velocity is approximately constant if b = 1.
In this work, the reset voltage is approximately constant, as shown in Figure 9a.
The reflectance of samples is approximately constant <0.1 in the whole range.
For stable conditions, the average radius is approximately constant (with thermal fluctuations).
Again, the curvature across the molecule is approximately constant; average, approximately 0.11 Å-1.
Inside the region D(E), vorticity is given by ω±=ω± that is approximately constant.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com