For aerobic exercise to be effective, it has to be long duration.
对有氧运动是有效的，它必须是持续时间长。
Conclusion This drug might be good effective bronchi dilator and could control and shorten duration.
结论帮备是一种疗效好，依从性好的支气管扩张剂，能有效控制病情，缩短病程。
The new power structure is effective during the transition period, whose duration was not specified.
新权力体制在过渡期内有效，但过渡期的期限并未明确。
The new power structure is effective during the transition period, whose duration was not specified.
新权力体制在过渡期内有效，但过渡期的期限并未明确。
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