The main causes are that the decrease of testicular function with aging is of a progressive course without a cut-point, and the serum level of T in the aging male has markedly individual variation.
主要原因是男子的睾丸功能与女性的卵巢不同，没有一个明确的终止界限，同时，健康老年男子的血浆T水平有较大的个体差异。
The main causes are that the decrease of testicular function with aging is of a progressive course without a cut-point, and the serum level of T in the aging male has markedly individual variation.
主要原因是男子的睾丸功能与女性的卵巢不同，没有一个明确的终止界限，同时，健康老年男子的血浆T水平有较大的个体差异。
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