他离开律师事务所去开一家面包店的决定并非一时冲动，而是精心筹划了五年的计划。
His decision to leave the law firm and open a bakery was not a caprice but a plan he had nurtured for five years.
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解释
未经深思的任性决定（本句以否定形式使用，说明决定经过深思熟虑）
His decision to leave the law firm and open a bakery was not a caprice but a plan he had nurtured for five years.
未经深思的任性决定（本句以否定形式使用，说明决定经过深思熟虑）