Lub luag haujlwm tseem ceeb Ntawm Cov Thauj Dej Dej Hom Mould Lub Tshuab Kub

1, txhim kho molding ua haujlwm ntawm cov khoom;

2, txo kev lag luam ntawm cov khoom puas tsuaj;

3, txhim kho cov tsos ntawm cov khoom, inhibit qhov khoom tsis xws luag;

4. Ua kom tiav cov sijhawm tsim khoom, txo kev siv lub zog thiab txuag nqi.