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him to directly ask Xie Yujia."Start by drawing the cross... Then it's like this, hmm, for a cylindrical gear, it looks like this. If it’s a conical gear, just draw half," Xie Yujia patiently taught...!"Xia Chengxiang standing outside was stunned for a few seconds as he pondered the meaning of this "touch". Then, he thought that with Lu L琳琳and Lu 莉Lili inside, nothing should go wrong.If...Before th...