Αναζήτηση
Ανακάλυψε νέους ανθρώπους, δημιούργησε νέες συνδέσεις και κάνε καινούργιους φίλους
a dark band in the spectrum of white light that has been transmitted through a substance that exhibits absorption at selective wavelengths
a dark band in the spectrum of white light that has been transmitted through a substance that exhibits absorption at selective wavelengths