The essential use case does not make these references.
基本用例不引用它们。
Comparing a system use case and an essential use case.
比较系统用例和基本用例。
The system use case has more steps than the essential use case.
系统用例的步骤比基本用例的步骤多。
To solve the above problems, this paper puts forward essential use case analysis technology.
本文提出了一种本质用况分析技术，它很好地解决了上述问题。
But the essential logic could use some illustration.
但必要的逻辑会用到一些例子。
However essential, farming is not the most lucrative use of water.
无论粮食是多么必要，耕地用水的效益是不高的。
Note that the use of the Velocity in this context is not essential.
注意，在本文中，Velocity的使用并不是必不可少的。
essential medicines quality, supply and rational use;
基本药物的质量、供应与合理使用；
Use when time to delivery is essential.
在必须（符合）交付时间的情况下使用。
Essential condition: Normal use of the watch functions!
基本条件：手表的功能正常使用！
If the information is essential, do NOT use commas.
如果此信息是重要的，不要使用逗号。
In a typical tube house, increasing the use of every space is essential.
在一个典型房屋体块中，提高每一块空间的使用是至关重要的。
Use of spreadsheets is an essential part of the day-to-day work of the Management Accountant.
使用电子数据表是一项管理会计每天都要使用的基本环节。
The human activities are the essential causes of land use change in Qiangtang River Basin.
人类参加的经济社会活动是流域内土地利用变化的根本原因。
Routeing charts are essential for use in passage planning and ocean voyages.
航路设计图对航线设计和大洋航行是必要的。
The essential thing is to think about what use you will make of your site.
重要的是要想一想，有什么用，你会令您的网站。
It is essential not to use other pins and nuts.
重要的是不要使用其他引脚和坚果。
In other words, the essential purpose of language use is to communicate.
换句话说，语言的基本功能就体现在其交际性。
You can only use your arms, hands and other essential body parts to climb.
你只能用手臂，手和其他身体部分来攀爬。
The first essential is to understand the principle—to learn how it works—how to use it.
首先，我们必须要明白万物皆有法，我们要掌握其中的规律和原理，已经我们如果能好好的利用它。
This program is a non-essential system process, and is installed for ease of use.
这一计划是一个非必要的系统过程，安装使用起来非常方便。
Therefore, take full use of our time in that it is essential to lead a full and happy life.
因此，充分利用我们的时间！因为这是充满快乐的生活必不可少的。
As a result, reasonable and effective control of urban land-use floor area ratio is essential.
因此，合理而有效控制城市土地使用容积率是至关重要的。
Has there ever been a time when the clear use of this sacred power was more essential or more urgent?
有哪一个时代，比我们今天更亟需清楚地运用此神圣力量？
For best results, each piece of film to use only essential oils of cotton.
为了达到最佳效果，每片棉片只使用一种精油。
The essential oil maintenance I just bought was really cool and easy to use.
刚买的这一系列精油调养品还真是好用耶！
The essential oil maintenance I just bought was really cool and easy to use.
刚买的这一系列精油调养品还真是好用耶！
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