Qhov tseeb, cov ntaub tsis-ntaub tsis yog ntaub tiag tiag, tab sis lawv zoo ib yam li ntaub hauv qee qhov khoom. Kev kis tus kabmob sib kis thaum ntxov xyoo 2020 tau coj kev lag luam tsis-woven rau hauv lub zeem muag ntawm ntau tus neeg. Xyoo tsis ntev los no, vim kev txhim kho txuas ntxiv ntawm kev siv thev naus laus zis thiab kev nce ntxiv ntawm kev xav tau ntawm kev ua lag luam, tag nrho kev tsim khoom tsis zoo thiab kev muag khoom qhia tau tias muaj kev vam meej.
Cov txheej txheem tsim khoom ntawm cov ntaub ntawv tsis-khaus yog luv, nrawm, tso zis siab, nqis peev qis, ua tau zoo hauv kev tiv thaiv ya raws, huab cua permeability thiab lwm yam khoom. Nyob rau tib lub sijhawm, nws tseem yog cov khoom lag luam decomposable thiab rov ua dua tshiab, uas yog kev lees paub ib puag ncig cov khoom lag luam.