科研之友
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<正>When Chris Johnson decided to take part in the London Marathon in October,2021,he was to achieve something amazing.As the father of three from Sunderland,he has tried to take part in the race for years.But 2022 might be his last chance to run long—Johnson has an incurable cancer.He started running in 2013 when he was in his early thirties.He began running most days,later entering 10 Ks and half marathons.Life later got in the way,but by 2017 he was still running a few miles a couple of times a week.In June 2019,everything changed.He started feeling weak and his energy levels
