Birds store energy as subcutaneousfat deposits or "body reserves"; changes in these reserves can be reliably estimated by measuring changes in body mass.
鸟类以皮下脂肪沉积或“身体储备”的形式储存能量；通过测量体重的变化，可以可靠地估计这些储备的变化。
2
They're eating the subcutaneousfat.
幼虫在那里吃皮下脂肪。
3
Incise the skin and subcutaneousfat, then palpate the lesion and excise the mass.