The difference in the estimates is attributable to the net effect of the higher non-conference-servicing costs associated with holding the meetings at The Hague, which more than offsets the lower conference-servicing costs associated with that location.
两项概算之间的差额是由于在海牙举行会议所涉的非会议服务费用较高，远远抵销了该地较低的会议服务费用。