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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The stock needs a catalyst to break out of this resistance zone to start another up-leg.

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My grandchildren came over the other morning, and they turned on children's TV on PBS. This used to be a commercial-free zone, where kids could at least get a head start growing up in a healthy, noncommercial environment.

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