An underground defensive position with a fortified projection above ground level for gun emplacements.
An underground defensive position with a fortified projection above ground level for gun emplacements.
掩蔽壕，地堡一个地下防御工事，有一个高干地面的，用来放枪的防御射击处
An underground defensive position with a fortified projection above ground level for gun emplacements.
掩蔽壕，地堡一个地下防御工事，有一个高干地面的，用来放枪的防御射击处