嚴格來說，病毒不應被視為生物，因為它們不是獨立生存，它們不能在沒有宿主細胞的情況下繁殖和進行代謝過程。
Viruses should not even be considered organisms, in the strictest sense, because they are not free-living; i.e., they cannot reproduce and carry on metabolic processes without a host cell.
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