в экспедиционных условиях.
Определение [Munro 2017]:
Field linguistics refers to the collection
of primary data on the basic grammatical facts of a relatively little studied language from ordinary speakers in a relatively natural setting, and to the analysis and dissemination of such data.(синее — небесспорно, к обсуждению)
Munro P. Field linguistics: Gathering language data from native speakers //
The Handbook of linguistics. 2nd ed., 2017.