At the earlier stages, the vehicles were controlled by hard track lines without any network operation.
早期的城市轨道交通车辆一般由硬线控制，没有网络或者网络不参与控制。
It's hard to keep track of the children's comings and goings.
这些孩子来来往往，很难跟得上他们的行踪。
It is hard to track the blue whale, the ocean's largest creature, which has almost been killed off by commercial whaling and is now listed as an endangered species.
作为海洋中最大的生物，蓝鲸很难追踪，但由于商业捕鲸，它们几乎灭绝，现在已被列为濒危物种。
It has been the big thing for a few years now, but it's extremely hard to track.
这已经是好些年来的老大难问题，但是依然十分难去追踪它。
It's just hard to keep track of them at first but they all generally mean the same thing, provide additional input to this program called GCC by just specifying it on the command line.
刚开始是很难理解这些词的,但其实都是一个意思，所以，只要在命令行上为这个程序,再添加一个名曰GCC的输入就OK啦。
The best time to stretch is after your muscles have had a chance to warm up. That's why most track athletes jog a mile or two, then do some stretching before the hard part of their workouts.
最佳拉伸时间是年肌肉热身之后，这就是为何大多数田径选手慢跑1-2英里后作一些拉伸，然后再开始训练单元中的艰苦部分。
Cash transactions are notoriously hard to track, in part because people use cash when they do not want to be tracked.
众人皆知，现金交易难以追踪，其部分原因是，人们就是在不想被追踪的情况下才使用现金。
However, with the direct coupling approach, the data access logic is interwoven with the application logic, making it hard to reuse, keep track of, and to modify.
然而，对于直接耦合方法，数据访问逻辑与应用程序逻辑相互交织，从而很难重用、跟踪和修改数据访问逻辑。
Unless your component is specifically designed for macros and automations handling a command during automation will lead to hard to track down issues.
如果你的组件不是为宏和自动化特别设计的，那么在自动化过程中处理一条命令将会很难跟踪到问题。
That has probably happened already, though the light symptoms shown by most patients make cases hard to track, he said.
这个或许已经发生，可是大多数病人轻微的症状让这些病例很难去追踪，他说。
To track down the true limits on your applications' speed, you need to be prepared to tackle both the hard and the easy problems of performance.
要追踪到您的应用程序在速度上的确切限制，您需要准备处理困难和简单的性能问题。
It differs from stealth technology, which does not make an aircraft invisible but reduces the cross-section available to radar, making it hard to track.
但它不同于隐形技术。隐形技术不是让飞机变得看不见，而只是减少能被雷达探测到的切面以使其难以被追踪到。
It's hard to assess the accuracy of these Numbers unless you actually track energy use over an entire year.
当然很难评价这些数据是否准确，除非你真的一整年都记录下来你的能源利用情况。
If they insist on a percentage for a small amount of cash, take a long hard look at their track record.
如果他们坚持要一定比例或少量的资金，那你就要好好考量一番他们的业绩记录了。
Because we work in different offices, it can be hard to keep track of where each of us is in our reporting.
由于我们在不同的办公室工作，因此跟踪相互之间的报道将会变的比较难。
Requirements were overlooked, scope was hard to track, and a significant amount of work and rework was wasted.
需求被遗漏，范围很难被跟踪，并且大量的工作和返工是无用的。
The data access logic is interwoven with application logic, which makes it hard to reuse the data access logic, as well as to keep track of it, and to modify it.
数据访问逻辑与应用程序逻辑相互交织，从而很难重用数据访问逻辑和跟踪该逻辑，以及修改该逻辑。
Smaller organizations, which sometimes provide overseas security, are thought to be more numerous, but are hard to track little more than a company President and a Rolodex full of names.
一些较小的机构有时也提供海外安全服务，据说这类公司数量更多，但却很难找到一公司小到只有一位公司经理和一个写满名字的花名册。
With so many food programmes and books telling you what you should and shouldn't eat to be healthy it's hard to keep track.
由于太多的饮食节目和书籍会提醒您，什么应该吃或不吃，以保持健康，所以很难有章可循。
"These things are notoriously hard to track down," he said.
“这种不名誉的事很难追踪。”他表示。
You'd lose a very important safeguard, and you could end up with hard-to-track bugs.
您将失去一种重要的防护措施，并且可能以难以跟踪的错误告终。
Keeping good habits is hard at the beginning but once it's in place, you'll never have to keep track of it because it will be natural.
一开始就保持良好的习惯真是太难了，可是，一旦坚持下来，习惯成自然，我们就不用劳心费力了。
The reason you should only focus on one goal at a time is that it’s hard to track a whole bunch of goals, and it’s hard to maintain focus on more than one goal at a time.
你一次应该紧紧关注一个目标的原因是紧紧关注所有的目标很困，并且一次很难保持注意着超过一个的目标。
Now a study in the journal Psychonomic Bulletin and Review shows that the reverse is also true: driving makes it hard to keep track of what we're talking about.
现在我们还知道，其实反之亦然——忙着开车的你可能会漏掉谈话内容。这是来自《心理规律研究与评论》杂志的观点。
With so many projects going on within IBM, it's hard to keep track of peers and where exactly they are located.
由于IBM在进行如此多的项目，很难跟踪同事和他们的确切位置。
Having left the fast track, many women find it hard to get back on.
如果以及错过了一班快车，很多女性发现要追回去实在太难。
This made it hard for regulators to keep track of a firm's exposure.
这使得监管人员很难跟踪公司承担的风险。
So, it can be hard for Banks to keep track of where the money actually goes.
正因如此，银行很难跟踪放贷后资金的去向。
So long as it keeps on track, it will continue both to thrive and to matter-and an EU that wants to remain relevant will find it increasingly hard to keep Turkey out.
只要土耳其坚定走下去，就会持续繁荣兴旺，举足轻重，而想要确保重要影响的欧盟总会发现，要把土耳其排除在外，日益困难。
So long as it keeps on track, it will continue both to thrive and to matter-and an EU that wants to remain relevant will find it increasingly hard to keep Turkey out.
只要土耳其坚定走下去，就会持续繁荣兴旺，举足轻重，而想要确保重要影响的欧盟总会发现，要把土耳其排除在外，日益困难。
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