Search for ways to lower overhead, such as free tools to track digital performance.
寻求各种方式来降低费用，如免费工具来跟踪数字化的性能。
One complete circular track appears in the lower part of the photograph.
照片的下部有一个完整的圆形径迹。
Magnetic levitation track longer, use efficiency is lower.
磁悬浮轨道越长，使用效率越低。
Magnetic levitation track longer, use efficiency is lower.
磁悬浮轨道越长，使用效率越低。
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