1. Are aisles between equipment and walls unobstructed? �豸��ǽ֮���Ƿ�ͨ���裿
2. When our nostrils are unobstructed, we involuntarily alternate breathing through one or the other about every two hours. �����ǵıǿ׳�ͨʱ������ÿ��Сʱ�ͻ������������ǿ��������
3. Exits should be unblocked(from the inside), unobstructed and well marked. The exit door should push to open, not pull to open. ���������豣�ֳ�ͨ���������κ��赲/�����������Ա�ʾ�����������ű������ƿ���������������
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adj.
1. free from impediment or obstruction or hindrance