[3] falling debris�����µ���ʯ

[4] hydraulically operated agitator arm��Һѹ���ƵĽ�����

[5] shot firing������

[6] power set cantilever��Һѹ������ǰ̽��

[7] spalling coal�������ú

[8] side flaps���໤��

[9] dismantling and reassembly����ж������װ��

[10] de-stress������Ӧ��

[11] sequence recommences���������¿�ʼ

[12] extrathick coal seams���غ�ú��

[13] spontaneous combustion����Ȼ������ȼ

[14] horizontal slices��ˮƽ�ֲ�

[15] strike������

��һҳ[1][2][3]