求翻译：本标准采用夏季典型日的室外热岛强度（广州中新知识城室外气温与夏季典型日气温的差值，即8：00～18：00之间的气温差别平均值）作为评价指标。是什么意思？

This standard adopts the typical summer day outdoor heat island intensity (difference between the outdoor temperature and the temperature of a typical day in summer in the new Knowledge City in Guangzhou, 8:00 ~ 18:00 the temperature difference between the average) as the evaluation index.

This standard is a typical day in summer the outdoor heat island intensity (Guangzhou city new knowledge in outdoor temperatures and summer temperatures on the typical difference, i.e. 8:00 to 18:00 a.m. ) the average temperature difference between the evaluation indicators.

This standard uses the summer typical date outdoor hot island intensity (in Guangzhou new knowledge city outdoor temperature and summer typical date temperature interpolation, namely 8:00~18:00 between temperature difference mean value) takes the appraisal target.

This standard uses the typical summer day outdoor heat island intensity (new knowledge in Guangzhou City outdoor summer typical temperatures and daily difference in temperature, temperature differences between the 8:00~18:00 average) as an index.

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