with在此什么用法
A
sample is placed at one end of a porous membrane and, as it seeps along to the
other, encounters a line of antibodies designed to recognise it. When the
sample is urine and the antigen is a hormone found in expectant women, you have
a pregnancy test. When the sample is mucus from a swab and the antigen is the
spike protein, it is a covid-19 test—a cheap, convenient one which can provide
results with in
half an hour.
最佳答案 2021-03-30 08:06
with in 为 within之误。你应该能看出这个typo的。提问前要先想想。
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