Picking a short phase that you play over and over in your head while running can help you stay focused and centered.
选择一个可以在你跑步时不停在你头脑中重复的短语，它能帮助你集中注意力。
For better or worse, in reality we are not centered in our head.
实际上，是好是坏，我们脑子里也没有主张。
Find a mantra. Picking a short phase, such as "One step at a time," that you play over and over in your head while running can help you stay focused and centered.
找一条咒语：选一条短句作为咒语，比如“一步一个脚印”，跑步的时候不断默念这句咒语有助于集中注意力。
If the optical head is on track, then the primary beam will be centered on a track (with pits and bumps) and the two secondary beams will be centered on land.
如果光学头在轨道上，主激光束将处于轨道中心，两个副光束处于轨道之间。
If the optical head is on track, then the primary beam will be centered on a track (with pits and bumps) and the two secondary beams will be centered on land.
如果光学头在轨道上，主激光束将处于轨道中心，两个副光束处于轨道之间。
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