qualitative difference, disparity, gap

measurement error, calculation error, discrepancy, deviation

crossing, intersection, (genetic) crossing over

difference, variation

to be moderate in, to be temperate in, to not do too much of, to refrain (from doing)

to insert, to put in, to thrust in, to plug in

to interfere (with), to hinder, to be hindered (from doing), to become impeded

to hold out, to extend (e.g. one's hands), to stretch, to reach out for

for the time being, at present, hindrance

to send back, to refer back

to shine, to be visible, to be tinged with, to rise (of water levels)

difference, disparity, gap