Kev tshawb fawb tseeb qhia tau tias Ntiaj teb cov xim tiv thaiv zaj duab xis (PPF)
Lub tswv yim tshiab "molecular anchoring thev naus laus zis" Tsim hauv Tuam Tshoj teeb tsa cov ntaub ntawv tshiab ntawm cov nplaum ntawm 28n / 25mm.
Ntxiv mus ntxiv, qee cov kev ntsuas tus lej tseem ceeb hauv kev kuaj mob heev hauv qhov nruab nrab qhov nruab nrab.