According to the design index of the environmental control and life support system of the "Shenzhou" spacecraft, the temperature of the return cabin of the "Shenzhou" spacecraft is 21°C±5°C, what is the maximum temperature of the return cabin?
按照"神舟"九号飞船环境控制和生命保障系统的设计指标，"神舟"九号飞船返回舱的温度为21℃±5℃，则返回舱的最高温度为多少℃
<gadget id="calculator">21 + 5</gadget>
<output>26</output>

<result>26</result>