Quite the contrary, just as the cook has to undergo an intensive training, mastering the skills of his trade, the writer must sit at his desk and devote long hours to achieving a style in his writing, whatever its purpose-schoolwork, matters of business, or purely social communication.
【译文】恰恰相反，正如厨师必须经过强化训练掌握烹饪技能，作家也必须坐在书桌前，花大量时间形成自己写作风格，不管他的着重点在哪儿——学校作业，商务事宜，还是纯粹的社交。
【析句】复合句，从句在前，as引导定语从句，mastering the skills是现在分词作伴随状语，主句在后，the writer must sit…and devote…writing，whatever its purpose作状语。