Those were the chief problems confronting us.
这是我们当时面临的主要问题。
System security is one of the chief problems in large-scale database design.
系统安全是大型数据库系统设计中的一个重要问题。
And this essay contains several chief problems under the condition of how to select design and practice methods reasonably.
本文在合理选择设计练习方法的前提下,抓住了几个主要问题。
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