千卡的英文：
therm

The unit of heat we use most frequently is the kilocalorie.
我们最常用的热量单位是千卡。

Inflate the Therm-a-Rest mattress by mouth as hard as possible, then quickly close the valve.
用嘴吹气垫使之尽可能膨胀到最坚硬，然后立即关闭阀门。