求翻译：空调系统内部排空后仍然会有一些残余压力留在管路中，所以在拆卸管路时应先松开各连接件，排除残余压力后才能将各个连接件拆下来。是什么意思？

Internal emptying after the air conditioning system will still be some residual pressure left in the pipeline, so the demolition of the pipeline should be the first release of all connections, and to exclude residual pressure to the connection removed.

Air-conditioning system has been drained there will still be some residual pressure in the lines remain in the line, so when you first release should be connected to each piece, and exclude any remaining pressure to remove the connector.

After the air-conditioning system interior evacuation still could have some remaining pressures to keep in the pipeline, therefore when disassembled the pipeline should first loosen various bridge pieces, after removed the remaining pressure to be able to open down each bridge piece.

Air conditioning system after emptying will still have some residual pressure in the pipeline, so removing pipe should loosen the fittings, excluding residual pressure before each connector removed.

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