陆上食物是非常有限的,根本没有什么能与一只海豹所能给北极熊提供脂肪和能量相比。
Food onshore is very limited and there is simply nothing comparable to a seal that provides a polar bear with fat and energy.
食物应当是适当的,也就是说应当提供足够的能量、蛋白质和微量营养素以满足儿童生长的营养需求。
Foods should be adequate, meaning that they provide sufficient energy, protein and micronutrients to meet a growing child's nutritional needs.
我们吃的大部分食物转化为葡萄糖用于向身体提供能量。
Most of the food we eat is turned into glucose, or sugar, for our bodies to use for energy.
So it's the amount of energy, usable energy for the body that a food provides.
所以卡路里是能量的总额,食物所提供的被人体吸收的能量
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