当环境温度低于热中性区时，单独的个体不能维持较高的恒定体温。
When ambient temperature falls below the thermal neutral zone, isolated young cannot maintain high constant body temperatures.
当环境温度低于热中性区时，单独的个体不能维持较高的恒定体温。
When ambient temperature falls below the thermal neutral zone, isolated young cannot maintain high constant body temperatures.
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