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。
It's necessary to bring a gift.
带礼物是有必要的。
It's very necessary to use public chopsticks more.
多使用公筷是很有必要的。
It's necessary to follow the rules in any games.
在任何游戏中，遵守规则都是必要的。
It's necessary to pick up rubbish and put it into dustbin.
拾起垃圾，把它放进垃圾箱是必要的。
It's necessary to wear the mask in the groups of people.
在人群中戴口罩是必要的。
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。
It's necessary to plan meals ahead of time and shop with a list to reduce food waste.
为了减少食物浪费，提前计划饮食并制定购物清单是必要的。
Timber ran short, and it was necessary to procure it from farther and farther away.
木材短缺，必须从越来越远的地方获得。
It is not necessary to establish yourself as top dog or leader of the pack by using extreme measure.
没有必要用极端手段来确立自己领头羊或群体领导人的身份。
It is not necessary to establish yourself as top dog or leader of the pack by using extreme measures.
没有必要用极端手段来确立自己领头羊或群体领导人的地位。
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。
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。
It will also be necessary to understand what sort of yield farmers might expect and to establish the plant's safety.
了解农民可能期望获得怎样的产量以及确定植物的安全性也将是必要的。
An improvement of the road network was considered necessary to ensure the import and export of goods to the district.
人们认为有必要改善道路网，以确保向该区进出口货物。
The dancers in these ceremonies wear masks, headdresses, and costumes that they believe are necessary to influence gods.
参加这些仪式的舞者戴着面具、头饰和服饰，他们认为这些是影响神的必要条件。
The nature of the geographic separation necessary to isolate populations depends entirely on the biology of the organism and its potential for dispersal.
地理上的隔离是隔离种群所必需的条件，且地理隔离的性质完全取决于生物体的生物学特性及其分散的可能性。
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。
She had resumed the travel necessary to add depth and colour to her novels.
她重新开始旅行以给她的小说增加深度和趣味。
The United States will do that which is necessary to meet its obligations to its own citizens.
美国会尽其对国民应尽的义务。
It soon becomes necessary to learn some grammar.
很快，学习一些语法就变得有必要了。
We all think it quite necessary to stop school bullying.
我们都认为制止校园霸凌很有必要。
Also, remember that sometimes it's necessary to cut down a tree.
另外，请记住，有时有必要砍倒一棵树。
It's not necessary to find a friend who is the same as you.
没有必要找一个和你一样的朋友。
To show the respect, it may be necessary to explain what the gift is.
为了表示尊重，人们可能需要解释礼物是什么。
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。
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。
When we teenagers have problems in getting on well with parents, it's necessary to put ourselves in our parents' shoes.
当我们青少年在与父母相处上遇到问题时，有必要站在父母的角度想想。
If we want to arrive at ten, I don't think it's necessary to set off so early.
如果我们想十点钟到达，我认为没有必要那么早出发。
Everyone finds it necessary to update his knowledge, otherwise he will be left behind the society.
每个人都认为有必要更新自己的知识，否则将被社会抛在后面。
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