Qhov thib ob, nws cov dej tsis kam muaj zog dua, thiab piv nrog lwm cov cuab yeej, nws tuaj yeem hloov mus rau ntau yam tsis zoo lossis hnyav ib puag ncig ntawm ib puag ncig adaptability.Piv nrog rau cov cuab yeej hluav taws xob, kev nqis peev ntawm cov cuab yeej pneumatic yog qhov loj, tab sis lub sij hawm ntev ...
Nyeem ntxiv