如果你像美国疾病控制与预防中心建议的那样，每周适度锻炼150分钟，或者少于150分钟，你可能就不是一个极限运动员。

If you're moderately exercising for 150 minutes a week, as the Centers for Disease Control and Prevention recommends, or less than that, you're probably not an extreme athlete.

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该组织目前正以大约每周一例的速度接收新的病例，其中许多疾病发生在如此年轻的人身上是极为罕见的。

The group is receiving new cases at a rate of about one a week, many of which are extremely rare at such young ages.

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研究发现，仅仅每周使用一次喷雾清洁剂，会导致患呼吸系统疾病的风险增加50%。

The use of spray cleaners as little as once a week increased the risk of developing the respiratory ailment by nearly 50 percent, the researchers found.

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