材料和精密加工。誰都知道這兩樣最難。不是一天兩天能趕上。這回被逼無奈，也許能安下心來慢慢發展了。誰知道。

來源: greenoasis 於 2019-06-02 09:40:53 [舊帖] [給我悄悄話] 本文已被閱讀：次

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