Ojantshi abashelelayo abajwayelekile, njengamanyensi ensimbi agingqike ngokubanda, asetshenziswa kakhulu kumadrowa asendlini. Zinezidingo eziphansi zokushisa futhi zingamelana nama-degree angu-70, okulungele ngokuphelele abantu. Njengoba ujantshi oshelelayo ojwayelekile unemicu yobuhlalu bepulasitiki, izivalo zenjoloba kanye nezingxenye zokuhlakaza zepulasitiki ngaphakathi kwesakhiwo, uma izinga lokushisa lingaphezu kwama-degree angama-70, ingxenye yepulasitiki izothamba, okuzothinta isicelo ngokuhamba kwesikhathi.