政府在必要时可以动用军队。
The government, when necessary, has recourse to the armed forces.
必要时，本能是你可使用的最可靠的资源。
When necessary, instinct is the most reliable resource you can fall back on.
必要的话，我在家时你也可以和我联系。
必要时医生会施行手术，但也许还不致如此。
The doctors will operate if necessary—but it may not come to that.
他们不怕应付这些问题,必要时也不惜进行唇枪舌剑的激烈争论。
They are not afraid to tackle the issues or let the sparks fly when necessary.
那么你是说，这将会坚定美国公众在必要时参战的决心？
So you're saying this will strengthen the American public's resolve to go to war if necessary?
必要时我们会动用空军力量来保护联合国维和部队的安全。
We will use air power to protect UN peacekeepers if necessary.
只在必要时冲厕所：这意味着不要把厕所当作垃圾桶使用以避免浪费水。
Only flush the toilet when necessary: this means to not use the toilet as a garbage to avoid wasting water.
我们为评估和干预创造机会，帮助客户和各大团体有效地应对现实问题，并在必要时对现实做出改变。
We create an opportunity for assessment and intervention, to help clients and communities cope effectively with their reality and change that reality when necessary.
他们通常倾向于在音乐和服装上有着非常相似的品味，他们把钱花在享乐上，并在必要时为假期或长期计划存钱。
They generally tend to share very similar tastes in music and clothes, they spend their money in having a good time, and save for holidays or longer-term plans when necessary.
必要时，他们愿为国捐躯。
一开始，小学生们将家庭作业的答案写在黑板上，随后老师评论、纠正，或在必要时详细解释。
At the beginning, the pupils put solutions to the homework on the board, then the teachers comment, correct or elaborate as necessary.
教师们表示，他们会在课程结束或放学后给予个别学生另外的辅导，必要时还会安排额外的作业。
Teachers say that they give individual help at the end of a lesson or after school, setting extra work if necessary.
冲击式压路机在工作时，对牵引力的要求进行科学准确的分析计算十分必要。
Scientific and accurate analysis and calculation on the requirement for traction force is necessary when the impact compactor is working.
虽然最初的目标是在可行的情况下提高船体，但是直到1982年1月所有必要信息都具备时，这项行动才得到批准。
While the original aim was to raise the hull if at all feasible, the operation was not given the go-ahead until January 1982, when all the necessary information was available.
每年有50万妇女在分娩时不必要地死去。
Half a million women die needlessly each year during childbirth.
必要时，这张桌子可以坐六个人。
这个程序在必要时将提醒你输入数据。
宵禁令是应对突发事件时必要的临时权宜之举。
The curfew regulation is a temporary expedient made necessary by a sudden emergency.
威廉姆斯将在每周被重新评估，必要时可能会动手术。
Williams will be reevaluated on a weekly basis, with surgery a possible option.
在中国，应邀去拜访朋友时，礼物是必要的。
A gift is necessary when one is invited to visit friends in China.
当调度员有电子地图时，你认为有必要用手画地图吗？
Do you think it necessary for dispatchers to draw maps by hand when they have electronic maps?
经济学家J.K.加尔布雷斯曾经写道：“当面对这样一个抉择，即改变自己的想法或证明没必要改变它时，几乎每个人都会忙于证明（没必要改变）。”
The economist J.K. Galbraith once wrote, "Faced with a choice between changing one's mind and proving there is no need to do so, almost everyone gets busy with the proof."
我们要使他恢复理智，必要时可用武力。
约有9%的人试图隐瞒自己“非必要的上网行为”，近4%的人报告说，他们“离线时也感觉被网络占据着大脑”。
About 9% attempted to conceal "nonessential Internet use", and nearly 4% reported feeling "preoccupied by the Internet when offline".
它们必须是可靠和直观的，以便于安排定期备份和在必要时检索文件。
They must be dependable and intuitive, making it easy to schedule regular backups and to retrieve files in a pinch.
必要时，涂一点蜂蜜，然后用绷带包扎。
In a pinch, dab on a little honey and then cover with a bandage.
在打喷嚏时，务必要用纸巾捂住口鼻。
他们开始考虑喝饮料时是否有必要使用塑料吸管。
They begin to think about whether plastic straws are necessary or not when drinking drinks.
在学校每天运动一小时对我们来说很有必要。
It's necessary for us to play sports an hour a day at school.
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