Dab tsi yog qhov phom sij ntawm cov yas uas siv tas sij hawm?

Cov tais yas uas siv tas sij hawm tuaj yeem ua rau muaj kev phom sij hauv qab no:
Txaus siab rau cov kab mob thiab cov kab mob: Thaum cov tais yas pov tseg tshaj lawv lub txee lub neej, cov kab nrib pleb me me yuav tshwm sim rau ntawm qhov chaw, thiab cov kab nrib pleb no tso cai rau cov kab mob thiab cov kab mob los nkaum hauv. Yog li ntawd, kev siv cov khoom siv yas pov tseg tas sij hawm yuav ua rau muaj kev pheej hmoo kis kab mob.
Tso cov khoom tsis zoo: Cov khoom siv yas pov tseg feem ntau yog ua los ntawm polystyrene (PS), uas tuaj yeem tso cov khoom seem thiab ua rau muaj kev puas tsuaj rau ib puag ncig. Yog tias cov tais yas uas siv tau tas sij hawm raug rau qhov kub siab lossis qis qis, lawv tuaj yeem tso cov khoom tsis zoo rau hauv cov zaub mov.