③O mea sili ona masani ona faʻaaogaina pulu talu mai le 21st seneturi, ua vave ona atiaʻe mea faʻapipiʻi pulufana, ma e tele ituaiga, e aofia ai le alumina, silicon carbide, boron carbide, silicon nitride, titanium boride, ma isi, e aofia ai alumina ceramics (Al₂O₃), silicon carbide cera...
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