Gas caij nplooj ntoos hlav yog ib tug elastic tivthaiv lug siv nyob rau hauv lub teb ntawm tsheb, rooj tog, mechanical khoom, thiab lwm yam., feem ntau yog rau kev txhawb nqa, buffering, thiab regulating cov lus tsa suab. Txawm li cas los xij, cov roj av tuaj yeem ua rau cov roj to thaum siv, uas tsis tsuas yog cuam tshuam rau lawv cov fu ...
Nyeem ntxiv