These acute exacerbations frequently follow a head cold exposure to smoke.
这常随感冒、多烟雾而急骤恶化。
These acute exacerbations frequently follow a head cold, exposure to smoke.
这常随感冒、多烟雾而急骤恶化。
However, little is known about the effect of depression on disease exacerbations.
然而对于抑郁症对于病情恶化的影响仍然知之甚少。
The disease has an unpredictable course with exacerbations and spontaneous remissions.
目前该病的进程难以预计，病情可逐渐恶化或自发性缓解。
Conclusions: Change in bacterial load is unlikely to be an important mechanism for exacerbations.
结论：细菌负荷的改变可能并非COPD加重的主要机制。
Conclusions: Change in bacterial load is unlikely to be an important mechanism for exacerbations.
结论：细菌负荷的改变可能并非COPD加重的主要机制。
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