The "down three zone" theory provides theoretical foundation for security evaluation.

下三带理论为分析、评价底板抗突水能力提供了理论指导。

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The" down three zone" theory provides theoretical foundation for security evaluation.

下三带理论为分析、价底板抗突水能力提供了理论指导。

youdao

Start out with at least three sessions a week, with 15 minutes of warm-up, 20 minutes at your aerobic training zone, and 15 minutes of cool-down.

开始你的有氧锻炼吧。每周至少做三次，花15分钟热身，20分钟做有氧运动，然后再用15分钟的时间让身体放松平静下来。

youdao

Start out with at least three sessions a week, with 15 minutes of warm-up, 20 minutes at your aerobic training zone, and 15 minutes of cool-down.

开始你的有氧锻炼吧。每周至少做三次，花15分钟热身，20分钟做有氧运动，然后再用15分钟的时间让身体放松平静下来。

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