例句與造句

1. These precipitation - hardened aluminum alloys gain their high strengths through heat treatment involving a severe quenching operation , which introduces a very high level of residual stresses
   這些鋁合金為獲得高強(qiáng)度，必須進(jìn)行固溶與時(shí)效處理，其中在淬火過(guò)程中會(huì)產(chǎn)生很大的殘余應(yīng)力。
2. It's difficult to find hardening aluminum alloy in a sentence. 用hardening aluminum alloy造句挺難的