它的五颜六色效果是由于硅藻的像玻璃外壳包围着机体的二氧化硅细胞壁。
The colorful effect is due to the diatom's silica cell wall, which encases the organism like a glassy shell.
病毒粒子一整个病毒粒子，由被蛋白质外壳包围的核糖核酸或脱氧核糖核酸组成，并构成一个病毒的传染形式。
A complete viral particle consisting of RNA or DNA surrounded by a protein shell and constituting the infective form of a virus.
泵的黄铜叶轮由铸铁扩散器、支架和外壳包围，使泵非常坚固耐用！
A brass impeller surrounded by a cast iron diffuser, bracket, and case makes this pump as strong as those used by your grandfather!
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