求翻译：　　1、一氧化碳（CO）：CO是无色无味的气体，它是一种窒息性的有毒气体，能使血液的输氧能力大大降低，使心脏、大脑等重要器官严重缺氧，引起头晕、恶心、头痛等症状，重至死亡。是什么意思？

1, carbon monoxide (CO): CO is a colorless, odorless gas, it is a asphyxiating toxic gases, can greatly reduce the ability of blood oxygen, the heart, brain and other vital organs, severe hypoxia, causing dizziness, nausea , headache and other symptoms, to death.

1, the levels of carbon monoxide (CO CO): A colorless and tasteless gas, it is a stifling of toxic gas, so that blood oxygen transfer significantly reduced, the heart, the brain, and other vital organs, serious oxygen cause dizziness, nausea, headaches and other symptoms, heavy to death.

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　　1, carbon monoxide (CO): CO is a colorless, odorless gas, it is a kind of asphyxiating poisonous gas makes blood oxygen capacity significantly reduced, which constitutes a vital organs such as heart, brain hypoxia, causing dizziness, nausea, headaches and other symptoms, to death.

　　1, carbon monoxide (CO): CO is a colorless, odorless gas, it is a kind of asphyxiating poisonous gas makes blood oxygen capacity significantly reduced, which constitutes a vital organs such as heart, brain hypoxia, causing dizziness, nausea, headaches and other symptoms, to death.