I also observed that the outer shell is completely matte.
还有一点，外壳是完全哑光的。
The outer shell of the virus is known as the viral envelope.
病毒的外壳被称为这个病毒的信封。
When the outer shell degenerates, it allows the central part of the disk to escape.
当外层发生退行性病变，造成椎间盘中央部分的逸出。
When the outer shell degenerates, it allows the central part of the disk to escape.
当外层发生退行性病变，造成椎间盘中央部分的逸出。
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