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<正> The so--called "principal term" of Goldbach problem, i.e., the principal orderof the number of representations of an even number as a sum of two primes. is evaluated herein a way quite different from the classical circle method. It is amazing that the author didthis with the knowledge just at the PNT (Prime Number Theorem) level, even withoutusing high-level theorems in analytic number theory as usual, e.g., Siegel-Walfisz Theorem.