一旦需要，就打电话叫人。
他把信件归档保存，一旦需要就可以立刻找到。
He keeps a file of letters so he can get his hands on one whenever he needs it.
他们都有一个共同的特点是，他们一旦需要帮助。
Another trait they all have in common is they get help when they need it.
再者，每一份信件往来日后一旦需要，都有案可查。
Also, every letter communication has a record and can be kept for further reference when needed.
一旦需要，粮农组织即作为一个"诚实中间机构"提供讨论论坛。
Whenever the need arises, FAO acts as an "honest broker" by providing a forum for discussion.
如果是活期存折储蓄帐户，一旦需要，你随时可以取款。
With a demand deposit , you would be able to withdraw money whenever you need it.
一旦需要计算这个积分，只需要计算这个函数的三重积分。
Once you have computed what this guy is, it's really just a triple integral of the function.
如果是活期存折储蓄帐户，一旦需要，你随时可以取款。
With a regular passbook saving account, you would be able to withdraw money whenever you need it.
这样，一旦需要还原到初始版本或配置，您就可以快速而轻松地做到。
This way if you need to restore to your original version or configuration, you can do so quickly and easily.
一旦需要采取行动保卫我们国家的安全，我们就采取行动。
When action is required to preserve our national security, we will act.
一旦需要，你会为了公司稳定建立的目的而暂时降低自己的生活标准吗？
Are you prepared, if needed, to temporarily lower your standard of?
这些列为可变是因为一旦需要节省开支，这一类支出是可以改变的。
These are also considered variable because you can cut back on how much you spend on these categories if you need to.
一旦需要给出识别一个机构或机械装置的特点，设计过程就开始了。
Once the need for a machine or mechanism with given characteristics is identified, the design process begins.
一般情况下，这种文件系统非常快，但是一旦需要进行垃圾收集，性能就会慢下来。
Normally, the file system operates very quickly, but when garbage collection is required, performance slows down.
然而，一旦需要在企业内部推广这些创意，以及随后将它们推向市场，光有创造力还不够。
But when it comes time to sell those concepts internally, and then later take those ideas to market, creativity is not enough.
一旦需要购买汽轮机上用的新轴承，或者石油，或者化肥，而拿不出外汇来，那简直是这些国家担当不起的一种风险。
Not to have the foreign exchange to buy a new bearing for a steam turbine, or oil, or fertilizer, when the need arises is a risk they simply cannot afford.
这些脚本将显示、隐藏、移动、创建和销毁文档对象以便实现动态效果，但是一旦需要从服务器获取更多数据，原页面就被新页面取代。
The scripts would display, hide, move, create, and destroy document objects to create dynamic effects, but any time more data was needed from the server, the page would be replaced with a new one.
根据拉姆斯·菲尔德的命令，美军方将把“毒刺”导弹运到已经部署的移动导弹发射架附近，一旦需要随时可以装上发射架。
According to Rumsfeld's order, U. S. military has moved 'Stinger' missiles to positions closed to mobile launchers that have already been deployed. If necessary, the missiles could be quickly loaded.
CLRJIT只能跟踪固定数目的寄存器分配变量；一旦需要跟踪的数目超出这个数目，它就开始将寄存器的内容移到内存中。
The CLR JIT can only track a fixed number of variables for register allocation; once it has to track more than this, it begins to spill the contents of registers into memory.
有时候在理想主义的引导下，可能会错误地介入一场战争，但是当一旦需要付出巨大的代价，承担巨大的风险时美国会选择退却。
Some times in under the idealism guidance, possibly can wrongly involve a war, but once needs to pay the huge price, when undertakes the huge risk, the USA Congress chooses retreats.
一旦需要转译的技术时，由MCEO的伊耶雅利祭司认可的发言人，便会公布由伊耶雅利祭司所提供的MCEO的CDT讯息盘翻译及相关资料。
Once skilled in translation, Speakers are then endorsed by the MCEO Eieyani Priests to publicly publish MCEO CDT-Plate translations and related information as provided by the Eieyani Priests.
你家里的运动探测器也会这样，所以小偷一旦进入屋内寻找可以偷的东西，就需要继续干扰。
So, too, would the motion detectors in your home, so the thief will need to continue jamming once he's inside and searching for things to steal.
一旦你有了一个创业想法，什么才是你作为一个企业家需要的最重要的特点呢？
Once you get an idea for a business, what's the most important trait you need as an entrepreneur?
但是，这项建议应以危险为由予以拒绝，因为无法保证一旦不再需要批准，监测指挥官的标准将继续得到遵守。
This recommendation should be rejected as dangerous, however, since there is no assurance that the watch commanders' standards will continue to be observed once approval is no longer required.
一旦损坏造成，农田需要许多年才能恢复。
Once the damage is done, it will take many years for the farmland to recover.
一旦野兔数量减少，嫩枝的数量需要两到三年的时间来恢复。
Once the hare population has declined, it takes two to three years for the quantity of twigs to recover.
一旦将一个燃烧着的打火机放在轮胎上，汽车需要几分钟才能点燃，这给了纵火犯大量的时间逃跑。
Once a burning firelighter is placed against a tyre, it takes a few minutes for a car to ignite, giving the arsonist plenty of time to escape.
一旦有客人到场，他们会在休息区或附近活动，接着到8:30左右，我们需要让他们转移到餐厅用餐。
Once the guests have arrived, they will be in and around the lounge area and then at around 8:30 we need to get them to move to the restaurant for their meal.
一旦有客人到场，他们会在休息区或附近活动，接着到8:30左右，我们需要让他们转移到餐厅用餐。
Once the guests have arrived, they will be in and around the lounge area and then at around 8:30 we need to get them to move to the restaurant for their meal.
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