Many types of exercises are aerobic, and by definition are performed at moderate levels of intensity for extended periods.
有许多类型的运动是有氧的，根据定义，它们是长时间的中等强度运动。
Many types of exercises are aerobic, and by definition are performed at moderate levels of intensity for extended periods.
有许多类型的运动是有氧的，根据定义，它们是长时间的中等强度运动。
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