And these include the herpesviruses and HIV, while the ones that lack the envelope such as poliovirus are called non-enveloped or " naked" viruses.

其包括疱疹病毒、人类免疫缺陷病毒（HIV）；而缺乏囊膜的病毒，如脊髓灰质炎病毒，被称为无囊膜病毒或裸病毒。

They are naked viruses, about 30 nanometers in diameter, and they're surrounded by an icosahedral capsid, which is a spherical protein shell made up of 20 equilateral triangular faces.

它们是直径约30纳米的裸露病毒，被二十面体衣壳包围；二十面体衣壳是由20个等边三角形面组成的球形蛋白质壳。