Learn to treat yellow jacket stings with expert tips from a fire captain in this free video about first aid treatments.

要学会在这个自由的视频处理与专家提示黄马褂刺消防队长从有关急救处理。

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Treat sand flea bites with tips from a firefighter in this free video on first aid.

沙蚤叮咬治疗与技巧在这个自由视频从消防队员急救。

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We provide first aid medicine-chest for free.

免费提供急救小药箱。

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And, unless you're Spider-Man (or Lynn Hill, the first person to free climb El Cap), you have to resort to aid to ascend it.

WSJ: Training for the Big Wall | By Michael J. Ybarra