Birds store energy as subcutaneous fat 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
Incise the skin and subcutaneous fat, then palpate the lesion and excise the mass.
切开皮肤和皮下脂肪，触及病变并切除肿块。
3
The skin flap is a compound tissue mass with blood supply of its own, including skin and subcutaneous tissue or the deeper level of tissue.