人们依照年龄从大到小做介绍。

People are introduced from the oldest to the youngest.

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"这本书将详细地介绍有关小冰河时期和其它气候变化的研究过程，但是，在我开始之前，让我先介绍一下历史背景。

This book will provide a detailed examination of the Little Ice Age and other climatic shifts, but, before I embark on that, let me provide a historical context.

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目的是介绍胸骨下段小切口在心内手术中的应用体会。

The objective is to introduce experience of infrasternal small incisions to intracardiac operation.

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