Heart rates around 55-60% of your maximum heart rate (220-(your age)=maximum heart rate) for a period of at least 30min is optimal for just burning fat.
Electric kettle, after a period of time without burning out of the water there is rust taste, how to remove?
电热水壶，经过一段时间，不再烧出的水有铁锈的味道，如何删除？
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After a period of burning helium and shrinking and expanding and then finally shrinking again, the Sun will wind up as tiny cinder known as a White Dwarf, fading away for the rest of time.