8. Cov qauv yog precession thiab cov dej nqus dej yog zoo meej.
9. Tus tsim yog tsim nyog, cov qauv yog tshiab, thiab nws yog ib qho yooj yim mus use.
10. Kev ntsuas yog qhov tseeb.
11. Nws yooj yim rau kev khiav lag luam thiab txhais tes xis nyob.
12. Cov khoom no yog nruab nrog cov khoom seem, thiab muab kev pabcuam zoo.
5ml nruam syringe R hom