How to understand negative texture coordinates in the 3d models .obj?

In obj files, including exported from .blend files, often negative texture coordinates.
vt -0.1837 1.0699
vt -0.2370 1.0699
vt -0.1838 1.2804
How to interpret them?
To take the module?
Subtract the module from the unit?
July 9th 19 at 13:17

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