Cov cwj mem cim tau tshwm sim kwv yees li xyoo 1950s. Nws cov thawj coj yog tus cwj mem, thiab cov lus sib xws yog "marker" lossis "Marker cwj mem". Transliterated, nws tig mus rau hauv lub cim cim raws li peb feem ntau xa mus rau niaj hnub no.
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Tus cwj mem yog ib qho tshwj xeeb xim cwj mem rau kev sau ntawv lossis pleev xim. Nws cov xim yog volatile. Raws li qhov tshwm sim, tus cwj mem cim qhia txog kev kos duab nrawm nrawm rau ntawm daim ntawv, thiab cov duab zoo li daj ntseg thiab tshiab.
