1. There is not enough headroom for buses to go under this bridge. ����ľ��ո߶Ȳ�����������������ͨ�С�
2. This arrangement is used where there is little headroom, as in trucks, buses, and rail cars. ������������ͨ������ͷ���ռ��С�Ļ������ϣ�����������������Լ��й�糵�ϡ�
3. Digital recorders and samplers produce audible distortion when they exceed their headroom (i. e. �����ּ�¼�����ֲ����������������ǵĿռ�ʱ���������ʧ�棨����
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n.
1. vertical space available to allow easy passage under something
2. the capacity of a system to reproduce loud sounds without distortion