Vim tias h7 coj cov khoom siv txhim kho sai, qhov ntau ntawm cov khoom siv zais h7 yog litter me ntsis.

Tag nrho peb cov khoom siv zais h7 yog siv “Quartz iav”.

Lub sijhawm lub neej ntawm peb cov khoom siv h7 zais yog li 2000 teev.

Lub luminous ntawm peb cov khoom siv h7 zais yog tib yam li h7 coj cov khoom siv.

Txhawm rau ua kom koj pom meej peb cov khoom siv h7 zais, kuv yuav qhia koj cov duab hauv qab no.

Vim tias tag nrho cov khoom siv zais h7 yog txhua yam tsim los ntawm kuv lub Hoobkas, tus nqi sib tw heev hauv ntiaj teb kev lag luam.

Yog tias koj tuaj yeem muab sijhawm rau peb cov khoom siv h7 zais, kuv paub tseeb tias koj tuaj yeem txuag sijhawm thiab nyiaj txiag ntau.