Kev loj hlob txij nkawm ntawm cov thawv waterproof

Nrog rau kev txhim kho cov thawv waterproof thiab qhov yuav tsum tau rau cov xov hlau thiab kev sib txuas lus, kev sib txuas, kev sib txuas, kev siv dej tsis sib xws, thiab lwm yam. Cov hnab yas dej yas tau ua tiav txawv teb chaws rau ntau dua 20 xyoo thiab tseem muaj siv dav hauv Suav teb. Ua ntej 2000, feem ntau ntawm cov thawv waterproof siv hauv Suav teb tau ua los ntawm cov hlau; Tom qab 2000, Tuam Tshoj cov cuab yeej thev naus laus zis txhim kho sai sai, thiab yas thev naus laus zis tau los ua cov ntau zuj zus. Cov thawv waterproof tau hloov maj mam hloov cov thawv hlau vim lawv tus nqi qis, rwb thaiv tsev zoo, thiab qib siab ntawm kev lim dej.