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1·This paper mainly introduces the research on the substitution of Aluminium bar by rare earth, magnesium and silica alloy on the process of chemical capping to rimmed steel during casting.

文中主要研究稀土镁硅合金替代铝条应用于沸腾钢浇注的化学封顶工艺。

2·I was thirteen years old. I wore steel-rimmed glasses and I was a very solemn boy.

那年我十三岁了，戴着一副银边眼镜，是个不苟言笑的男孩。

3·He was a tall man and wore steel-rimmed spectacles.

他是个高个子，戴着钢框眼镜。