他有那种难以言表的特质，体现出他是专业而非业余的。
He has that je ne sais quoi that distinguishes a professional from an amateur.
这样做的总体结果就是业余爱好者想在专业地质学期刊上发表文章就更难了，而评审制度的广泛采用又进一步加强了这一结果。
The overall result has been to make entrance to professional geological journals harder for amateurs, a result that has been reinforced by the widespread introduction of refereeing.
同样的道理也适用于有意为之的业余人士，他们可以说是训练中的专业人士。
The same applies to the deliberate amateur who is, so to speak, a professional in training.
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