T here are cases, however, where these two forms are not interchangeable in that the present perfective progressive has also the meanings of continuousness, temporariness and incompleteness .
但是,由于现在完成进行体还带有进行体的持续性、暂时性和未完成性的含义,有时就不可以与现在完成体互换使用。比较。
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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