It is necessary initially to classify the headaches into certain types.
起初把头疼分成若干类别是有必要的。
I think at the beginning of each book a brief introduction to it is necessary.
我认为每本书开头的简短介绍都是很有必要的。
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。
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。
Sometimes it is necessary to say no.
有时候说“不”是必要的。
It is necessary to examine how the proposals can be carried out.
有必要调查一下怎样才能实施这些方案。
To understand why they are doing it, it is necessary to know where they are coming from.
要理解他们为什么这样做，有必要知道他们的想法。
Don't call him unless it is necessary.
除非有必要，否则不要给他打电话。
It is necessary for developing a strong working spirit.
培养强烈的劳动精神很有必要。
It is necessary to read the labels on the foods in a shop as well.
阅读商店里食品的标签也是必要的。
Do you think it is necessary for Sunny to give tips for the service?
你认为桑妮有必要为服务给小费吗？
It is necessary to do further study and development on the pine cone.
有必要对松果进行进一步的研究和开发。
It is necessary for us to control our desires in this consumer society.
在当今这个消费者主导的社会中，我们很有必要控制自己的欲望。
It is necessary to learn to manage time and make good use of every minute.
有必要学会管理时间，好好利用每一分钟。
It is necessary for the prince to know well how to use the beast and the man.
王子懂得如何使用兽和人是很必要的。
It is necessary for schools to satisfy the need of all the students' development.
学校有必要满足所有学生的发展需要。
It is necessary for you to read all instructions carefully before every experiment.
你有必要在每次实验前仔细阅读所有的说明。
In order to master grammar knowledge, it is necessary to practice as much as possible.
为了掌握语法知识，尽可能多做练习是有必要的。
It is necessary to provide specific praise about actual actions performed and efforts made in the process.
对过程中的实际表现和付出的努力给予具体表扬是有必要的。
Remember that forgiveness does not mean it is necessary to become friends again with the person who upset you.
记住，宽恕并不意味着你必须和惹你心烦的人再次成为朋友。
It is necessary to give others rights and chances to speak since the problem may concern them in different ways.
给别人说话的权利和机会是必要的，因为问题可能以不同的方式影响到他们。
In common with many of my classmates, I think it is necessary to update the multimedia equipment in the classroom.
和我的同学们一样，我认为有必要更新教室里的多媒体设备。
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