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The phrase "a first cross" is correct and usable in written English
It can be used in contexts related to genetics, breeding, or any situation where the initial combination of two different entities is being discussed. Example: "In the study of plant genetics, a first cross between the two species resulted in a hybrid with unique traits."
Exact(1)
A first cross Andalusian is a crossbreed that is 50 percent Andalusian, while a second cross Andalusian is the result of crossing a purebred Andalusian with a first cross – resulting in a horse of 75 percent Andalusian blood.
Similar(59)
Parasitological data come from a first cross-sectional survey carried out to study the spatial distribution of selected helminths in sheep farms.
In a first cross-sectional analysis, we could not distinguish a sub-group of BD patients with an elevated baseline CRP level based on affective state or rapid cycling state.
That kind of feature is still a relatively distant vision – Tesla CEO Elon Musk said last year that he hopes to do a first cross-country test drive of a fully autonomous Tesla car by the end of 2017, and that means a broad release will follow some significant amount of time later.
The present analysis was intended to provide a first cross-genomic prediction of potential T3SS effectors and certainly leaves room for future improvement.
A first cross-national study [ 7] including 11 countries from the Survey of Health, Ageing and Retirement in Europe revealed consistent relationships across countries between the GALI and other measures of disability in the older population.
In a first cross-sectional pilot study in our hospital we found a point prevalence of 88 patients with defined diagnosis of CIM/CIP and ICU-acquired muscle weakness per month.
By compiling micrometeorological methanol flux data from eight different sites and by reviewing the corresponding literature, this study provides a first cross-site synthesis of the terrestrial ecosystem-scale methanol exchange and presents an independent, data-driven view of the land atmosphere methanol exchange.
Our study, which is part of the EU Joint Action on Healthy Life Years [ 8], contributes to a better understanding of the European indicator HLY in providing a first cross-validation of the GALI in adults aged 15 years and older.
Here we compiled micrometeorological methanol flux data from eight different study sites and reviewed the corresponding literature in order to provide a first cross-site synthesis of the terrestrial ecosystem-scale methanol exchange and present an independent data-driven view of the land atmosphere methanol exchange.
The main objective of this study is thus (i) to compile the available ecosystem-scale methanol exchange data from micrometeorological flux measurements, (ii) to conduct a first cross-site synthesis of the magnitude of and controls on the terrestrial net ecosystem methanol exchange and (iii) to provide an independent constraint on the land methanol exchange against which models can be compared.
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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