Allan is rite: highland symptons would become obvious while doing long-time excercise. I felt good for 1st 10K but the time was still 56'. Another 10K took me 1 hour.
Time elapsed was 2 hours 5 minutes while crossing the half-way mark (21km). Then I decided to practice walking halff-marathon as there was no hope of PB! This is the first time that I walked for such a long distance at a marathon race. The average speed was around 7.5Km/hour. I even overtook some exhausted guys. Then I started to run again around 39Km, overtaking some more guys and finished at 4hours 42minutes. I do satisfy with this result. I really enjoy this race.
The atmosphere is pretty good! Lanzhou people are really enthusiastic and cheerful. Almost two sides along the course were crowded with people, cheering up atheletes! Really touching, so we dared not to slow down even we walked!
There were enough water stop and first-aid station. The volunteers were initiative as well as helpful! Thank you LANZHOU!