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The phrase "a speed of approx" is correct and usable in written English.
It can be used when providing an estimated speed measurement in various contexts, such as scientific, technical, or casual discussions.
Example: "The vehicle was traveling at a speed of approx 60 miles per hour."
Alternatives: "an approximate speed of" or "a speed of approximately".
Exact(1)
The vesicles themselves were motile with a speed of approx. 60 nm/sec (Fig. 1C, c).
Similar(59)
It delivers a continuous shooting speed of approx. 5 frames per second in FX format (36 x 24) or 5 4 (30 x 24), and 7 frames per second in DX format (24 x 16)*4*5.
With two steered front wheels and two powered rear wheels, it can reach speeds of approx. 45km/h at a weight of slightly over 60kg.
The D3X is capable of recording approx. 7.1 MB (JPEG, image size L, NORMAL) of data captured in FX format at speeds of approx. 5 frames per second.
"This place occupies a sweep of approx. 18 city blocks — liquor, liquor, liquor everywhere. . . .
Each translation sequence lasted for approx. 560 ms, corresponding to a translational velocity of approx. 1.8 m/s.
The polymer has a Tg of approx. 210°C and a Tm of 395°C.
The analysis area had a diameter of approx. 0.65 mm.
Each experimental scanning session had a duration of approx. 7 min 48 secs.
EIA alone appeared to miss approx. 20% of cases, with a sensitivity of approx. 80% compared to the other approaches.
The bottom destination of the top 5 has a CPM rate of approx $61.
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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