I don't think any of these outdoor activities are dangerous if we are careful.

假如我们小心的话，我觉得这些户外活动都不危险。

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Outdoor activities can expose you to several safety hazards, but you can take these steps to prepare for them.

室外活动会把你暴露在一些安全危害中，但是你可以采取以下的措施来为它们做准备。

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It's encouraged on these high level days to limit your outdoor activities and stay indoors.

空气质量指数高的日子应限制室外活动，尽量待在室内。

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Apart from these, the company also sells footwear in categories like aquatic activities, baseball, cheerleading, football, lacrosse, outdoor activities, skateboarding, tennis, volleyball, walking, wrestling, and other athletic and recreational uses.

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