Feem ntau muaj 5 yam khoom sib txawv ntawm lub hnab ntim: lub hnab tiaj tus, lub hnab ntim khoom, lub hnab ntim khoom sab nraud, lub hnab ntim hauv qab thiab zaj duab xis yob.Cov 5 hom no yog cov siv dav thiab dav tshaj plaws.Dhau li, cov khoom sib txawv, cov khoom siv ntxiv (xws li zipper, dai qhov, qhov rais, valve, thiab lwm yam) lossis s ...
Nyeem ntxiv