Some adjustment of the lens may be necessary.
可能需要调整一下镜头。
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。
We are still looking for someone who combines all the necessary qualities.
我们仍在寻觅兼备所有必要才能的人选。
Some forethought and preparation is necessary before you embark on the project.
你着手进行这个项目之前必须有所考虑，有所准备。
The curfew regulation is a temporary expedient made necessary by a sudden emergency.
宵禁令是应对突发事件时必要的临时权宜之举。
British and American warships are standing by to evacuate their citizens if necessary.
英美战舰已做好准备一有必要就撤出本国公民。
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。
An objective set of rules which we all agree to accept is necessary for any ordered society.
任何井然有序的社会都需要一套客观公正、为大家所接受的规则。
I may look like a tenderfoot, but I think I can follow a trail or carry a pack if necessary.
我也许看起来像个新手，不过有必要的话我认为我也能跟着上路或扛包。
So you're saying this will strengthen the American public's resolve to go to war if necessary?
那么你是说，这将会坚定美国公众在必要时参战的决心？
The publisher is responsible for obtaining the necessary permissions to reproduce illustrations.
出版者负责取得准予复制插图的必要许可文件。
Since the costs of science were rising faster than inflation, some restriction on funding was necessary.
既然科学成本上涨快于通货膨胀，资助上的一些限制是必要的。
It provides some necessary nutrients.
它提供了一些必要的营养物质。
Luntz's recommendation wasn't necessary.
伦茨的建议并不是必要的。
At least three years' study would be necessary to achieve the literacy competence necessary to grapple with the material she analyzes.
要掌握她所分析的材料所需的读写能力，至少需要三年的学习时间。
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。
The report concluded that no substantive changes were necessary.
报告的结论是，无须作任何重大变更。
The government, when necessary, has recourse to the armed forces.
政府在必要时可以动用军队。
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。
I couldn't enter the country because I didn't have all the necessary documentation.
我不能入境是因为我证明文件不齐备。
Use a kettle with an automatic cut-out so it doesn't boil for longer than necessary.
使用一个有断流器的水壶，这样水开后它会自动断电。
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's necessary to bring a gift.
带礼物是有必要的。
You should obtain the necessary visas.
你应该获得必要的签证。
Don't call him unless it is necessary.
除非有必要，否则不要给他打电话。
It's necessary for us to do so in public.
我们在公共场合有必要这样做。
They won't leave anything necessary behind.
他们不会把任何重要的东西落下。
Vegetables are necessary in our daily life.
蔬菜是我们日常生活中的必需品。
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