It is necessary that we weigh the pros and cons of including English words in Chinese dictionaries.
权衡在汉语词典中加入英语单词的利弊，这对我们来说是很有必要的。
To compare the compositions of a meteorite and the Sun, it is necessary that we use ratios of elements rather than simply the abundances of atoms.
为了比较陨石和太阳的成分，我们需要利用元素的比率，而不单单是原子的丰度。
It is necessary that a critic develop a sensibility informed by familiarity with the history of art and aesthetic theory.
批评家必须在熟悉艺术史和美学理论的基础上培养一种感性。
It is necessary that we help the disabled.
我们很有必要帮助残疾人。
It is necessary that everyone be there in time.
大家都按时到达那里是必要的。
It is necessary that we buy Christmas gifts now.
我们有必要现在就买圣诞礼物。
It is necessary that food be sent to them at once.
有必要把食物立即给他们送去。
It is necessary that he read English aloud every day.
你们每天大声读英语是很有必要的。
It is necessary that you train yourself before the walk.
在步行前你锻练自己是很有必要的。
It is necessary that we should clean the room every day.
我们每天打扫房间，这是必需的。
It is necessary that we young people master a foreign language.
我们年轻人掌握一门外语是必要的。
It is necessary that a good drilling engineer should know foreign languages.
一个好的钻井工程师必须懂得几门外语。
It is necessary that society should look at these things, because it is itself which creates them.
社会必须正视这些事，因为这些事是它自己制造出来的。
However, in order to derive the benefits of a toolset, it is necessary that it be correctly configured.
然而，为了得到工具集的好处，正确地配置工具集是必要的。
However, it is necessary that you have information about your lawn mower such as the model and brand.
不过，这是必要的，你的资料，您的草坪割草机等模型和品牌。
To understand Berkshire, therefore, it is necessary that you understand how to evaluate an insurance company.
要了解伯克希尔，你必须知道如何评估一个保险公司。
It is necessary that the server (Jetty, for example) is already running and that the project area has already been created.
这需要服务器(例如，Jetty)已经处于运行状态，而且项目区域已经创建完毕。
The absolute should be practicable. It is necessary that the ideal should be breathable, drinkable, and eatable to the human mind.
绝对应能起作用，理想应是人类精神能呼能吸能吃能喝的。
A constraint can explicitly use the word "MUST HAVE", or it might be more implicit like "it is necessary that," (and usually need to be "enforced").
约束可以使用“必须具有”这样明确的表述，也可以是比较隐含的，比如“它需要”(“需要”常常意味着“必须”)。
A constraint can explicitly use the word "MUST HAVE", or it might be more implicit like "it is necessary that," (and usually need to be "enforced").
约束可以使用“必须具有”这样明确的表述，也可以是比较隐含的，比如“它需要”(“需要”常常意味着“必须”)。
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