The phrase "primary origin" is correct and usable in written English.
You can use it when you need to describe the source or starting point of something. For example: "The primary origin of this problem can be traced back to a single decision."
Any classification of metamorphic rocks tends to stress either their fabric, mineralogy, or primary origin.
The fallopian tube has been implicated as the primary origin of pelvic serous cancers.
Five of the pathways – for urology, cancer of unknown primary origin, sarcoma, brain and central nervous system, and skin cancer – were described as particularly problematic.
Very high levels of carbonates (∼60%), but also of gypsum, both to large extents of primary origin, indicate the incorporation of material derived from marls and limestone.
What makes the iris a good way to identify people? A. The primary origin of the unique character of the human iris lies in the process of development of tissue in the human embryo.
Whilst a fraction of these particles may be due to new particle formation with limited growth (so called "apple" new particle formation events25), or open ocean nucleation26,27, an Arctic ultrafine primary origin can also not be ruled out9,28.
This necessity occurs when the treating physician doubts for the primary origin of headache.
The amplified amplitudes often well exceed the amplitudes of incident waves from the primary origin.
These observations provide evidence for a primary origin of the observed remanences.
Diagnostic tests are necessary therefore when the treating physician doubts for the primary origin of headache.
Instead, the data suggest that sporadic epithelial ovarian carcinoma has either a monoclonal or a dual primary origin.
