Key Issues in History的意思|示意

Firstly, this paper introduces the history of extensible OS, and then analyses three key issues in memory management under extensible OS, which are performance, extensibility and integrity.

本文首先介绍了可扩展操作系统的历史背景。然后，分析了可扩展操作系统结构下设计存储管理子系统的三个关键问题：性能、可扩展性和完整性。

Duchamp's Fountain is the key to understanding the art history in the 20th century, for it has brought about a series of issues about the art essence.

杜尚玩笑式的现成品《泉》是理解20世纪艺术史的关键，由它引发出了一系列关乎艺术本原的问题。

In this paper, we summarized the history, actuality and development trend of fertilization model research, and pointed out the key issues of quantitative fertilization research in future.

对施肥模型和参数研究的历史、现状和趋势进行了综述，并指出今后定量施肥研究的关键问题。