But sadly, no central planner can know which people need to go where when and how much value should be attached to each trip. Only the individuals themselves know this.
但遗憾的是，没有哪个中央计划系统能知道人们什么时候需要去哪儿，以及他们的行程有多大价值，这只有当事人自己才知道。
Correlation predicates typically compare some key value in the event, such as a unique trip identifier, with a metric containing the same key.
关联谓词通常将事件中的某个键值(例如唯一旅行标识符)与包含相同键的度量作比较。
According to a popular saying the value of life is not measured in the number of years, the same way the value of a trip is not calculated by the number of destinations!
有一句广为流传的名言是这样说的，生命的价值并不是以年龄的大小来衡量的。同样，一场旅行的价值也不是以目的地的数量来计算的！
The "round trip" approach to use case transactions shows its value in the case of estimating the complexity of user interfaces.
用例事务的“环形路线”方法，在估算用户界面复杂性方面显示出其价值。
Even if you've never taken a family vacation (or it's been a long time), I think you'll see the value of this cross-country trip metaphor.
即使您从未有过家庭度假(或者已经过去很长时间了)，我也认为您会看到这一越野旅行比喻的意义。
For each type of shopping trip, shoppers look for, and can now find, the channel that provides most value.
对于每个类型的购物之旅，购物者找寻，而且现在能找，提供大多数的价值的通道。
The method is simple and it has some actual value in the stage of trip distribution forcast in transport planning.
表明此方法操作简单，在实际交通规划的出行分布预测阶段，具有一定参考价值。
The temperature protections incorrect trip in auxiliary equipment system of the thermal power plant often happens for the sudden changing of the temperature measurement value.
火力发电厂辅机系统中的温度保护经常因为温度测量值的跳变而发生误动。
Thirdly, the transaction costs for trading SIF contracts will not be proportional to the contract value. Instead, it will be a flat fee per contract for a round trip.
第三、期货的交易费用与合约的价值无关，而是按买卖合约数目收费的。
I recently traveled to London where my hard-earned U. S. dollars were worth just 75% of their original value. This made London a very, very expensive trip.
最近我去了趟伦敦，在那里我辛苦赚来的美元只值它原始价值的75%，这使得伦敦之行对我而言变得十分昂贵。
Meanwhile, the U. s. dollar has lost about one-third of its value compared with the Aussie since the end of 2008, making the trip increasingly expensive for Americans.
此外，美元自2008年底以来对澳元下跌了三分之一左右，让美国人的赴澳之旅变得越来越昂贵。
On the contrary I was proud of realizing my value through this practice. Though our trip was full of difficulties and the fair was not big as I thought before, the experience was worth remembering.
虽然旅途中有种种的困难和挫折，展销会也不如自己想象的那么盛大，也没有想象中商场的激烈谈判，但是所经历的一切还是很有意义的。
On the contrary I was proud of realizing my value through this practice. Though our trip was full of difficulties and the fair was not big as I thought before, the experience was worth remembering.
虽然旅途中有种种的困难和挫折，展销会也不如自己想象的那么盛大，也没有想象中商场的激烈谈判，但是所经历的一切还是很有意义的。
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