程卓称中国本土最长的日环食将在云南省瑞利发生，时长8分17秒。
The longest duration of the annularity on China's territory would be 8 minutes and 17 seconds in Ruili, Yunan Province, Cheng said.
程卓称中国本土最长的日环食将在云南省瑞利发生，时长8分17秒。
The longest duration of the annularity on China's territory would be 8 minutes and 17 seconds in Ruili, Yunan Province, Cheng said.
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