然而我知道得很清楚我不可能成功没有艰苦的努力。
However I knew very well that I could not succeed without painstaking efforts.
然而我们必须清楚地认识到，不是所有转换都明显于表面的可识别性。
However, we must clearly recognize that not all of the transformations are meaningful and distinguishable.
然而我们必须清楚地认识到，不是所有转换都明显于表面的可识别性。
However, we must clearly recognize that not all of the transformations are meaningful and distinguishable.
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