他一一追溯免费产品的历史，从20年代Jell - O果冻所推出的数十亿本免费食谱，到今时今日各项电邮程序的免费供应。
He traced the history of free products from Jell-O's giveaway of billions of free recipe books starting in the '20s to today's free E-mail programs and beyond.
《史记》徐广注是目前所存最早的《史记》注本，记载了六朝时期的《史记》异本，对校正今本《史记》之讹具有重要价值。
It records variant editions of the Historical records during the Six Dynasties, which contribute to correcting the misprints of existing editions of the Historical records.
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