with在此什么使用方法

Asample is placed at one end of a porous membrane and, as it seeps along to theother, encounters a line of antibodies designed to recognise it. When thesample is urine and the antigen is a hormone found in expectant women, you havea pregnancy test. When the sample is mucus from a swab and the antigen is thespike protein, it is a covid-19 test—a cheap, convenient one which can provideresults with inhalf an hour.

with in 为 within之误。你应该能看出这个typo的。提问前要先想想。