以下为句子列表：
英文: A direct drive system, used on track bikes, in which the chain ring and rear cog are linked, so that the pedals turn constantly while the bicycle is moving, and coasting isn't possible.
中文: 固定飞轮，或称“死飞”，飞轮与后轮轴皮连为一体，脚踏转动与后轮转动完全同步，无法实现一般棘轮飞轮自行车的脚踏不动时的滑动。
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