求翻译：使用时间不应过长，即间断吸入时间不应超过3～4天、连续吸入2小时应间断吸入氧气15分钟，大量长时间吸入可能会造成骨髓抑制。是什么意思？

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Time-of-use should not be too long, the continuous suction time should not exceed 3 to 4 days, continuous suction 2 hours 15 minutes should be an uninterrupted inhaling oxygen inhalation, substantial long time may cause bone marrow suppression.

The period of revolution should not grow, namely the interrupted inspiration time should not surpass 3~4 day, the continual inspiration for 2 hours should interrupt the inspiration oxygen 15 minutes, the massive long time inspiration possibly can create the marrow suppression.

Use should not be too long, that time should not exceed 3-4 continuous inhalation days 2 hours should be continuous, continuous inhalation inspired oxygen for 15 minutes, a lot of long time inhalation may cause bone marrow suppression.

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