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
The skin consists of three layers: the epidermis, dermis and subcutaneous tissue.
皮肤有三层：表皮、真皮和皮下组织。
3
In the first stage, the trypanosomes multiply in subcutaneous tissues, blood and lymph.