irregular feed running 运转不平稳
·2,447,543篇论文数据，部分数据来源于NoteExpress
Many runners do not have access to a track or treadmill and the irregular surfaces of cross-country running provide obvious hazards; therefore, most take to the roads.
很多跑步爱好者没有机会到跑道或是跑步机上跑步，越野跑的不规则路面又会有显著的风险，因此大家都习惯到马路上跑。
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