For laying indoors, in tunnel or cable trench, unable to bear external mechanical forces.
室内，隧道及电缆沟内等场所，不能承受机械外力。
For laying in doors, in tunnel and in cable trench, unable to bear external mechanical forces s.
室内，隧道及电缆沟等不能承受机械外力的场所。
For laying in doors, in tunnels and in cable trench, able to bare external mechanical forces and certain puling force.
室内，隧道，电缆沟，竖井等能承受机械外力和一定拉力的场所。
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