These layers and be added or removed dynamically and you can change each layer as it has a track that lets you change it as a function of time by inserting keys at certain frames in the track.
这些层可以被动态的增加或删除，你也可以对这些层进行改动，因为每层都有一个轨道，你可以在轨道中的特定时间点加入关键帧到达改变动画的目的。
The system can track 15 to 20 performers at a time and 64 different speaker arrays can receive the system's output.
这个系统可以同时跟踪15到20名的表演者，64个不同喇叭阵列可以进行系统的声音输出。
R And the track has a radius R, and at this moment in time the angle equals theta, and here is the object.
轨道半径是，在这个时刻,角度等于θ,这是物体。
Now, there are a slew of apps aimed at making your domestic life easier, from helping you pay your bills on time to keeping track of your kids.
现如今，有大量的应用正致力于使你的家庭生活变得容易，从帮助你及时的支付账单，到时刻跟踪你的孩子们的行踪。
Think of it as a railroad car hurtling down the line at the same time that attendants scramble to hitch on the wheels and lay the track.
而这就像当一辆有轨电车沿着路线疾驰的同时，乘务员在极力减缓车速以便铺设新的轨道。
Riders may find themselves inching along behind a lumbering freight train for miles at a time, until the route reaches a side track on which the Amtrak train can pass.
旅客有时会发现列车在木材运输列车之后缓慢爬行数英里，直到遇到美国国铁列车可以通行的侧轨。
Sometimes they drove to the grounds of rich men, whose properties were so large that they could not keep track of cars that parked in dark corners for half an hour at a time.
有时候他们开车到有钱人的园地里做，那地方太大了园丁们根本管不过来那些把车停半个小时就走的人。
It's easy to lose track of your time and life if you just take it one day at a time and never lift your head up to look straight ahead.
这容易浪费你的时间和生命，如果你只是要一天一天地过不会提起你的头到直视前方。
Keeping track of the changes as they are made allows for a reconstruction of the record at a point in time and gives a full audit trail of a given record.
在发生更改时跟踪更改，可以及时重建记录，从而提供特定记录的完整审计轨迹。
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。
If you find that the employee is doing a poor job, there will be time to go back and get the complaining employee's input, but you should be on a track to remove the poor performer at that point.
如果你发现他们的工作表现很差劲，那么你应该回去仔细考虑抱怨者的信息，但是你应该考虑将表现差的员工开除。
These had flourished at a time of chronic skills shortages, when hairdressing and catering qualifications opened up a fast track to permanent residence in Australia.
这些学校在澳大利亚长期缺乏职业技术人员的情况下，如雨后春笋般冒出，那时，诸如美发，餐饮等职业资格能够提供一条快速的移民澳大利亚的通道。
Local decision-making there was required on and near the track, but at the same time there was a need for a headquarters to co-ordinate the different local operations.
在铁路上或铁路边需要及时作出决策，同时也需要总部协调不同的局部工程。
The Golden Age (1970-1995) : Build a growing business with a consistently profitable track record (after at least 5 quarters,) and go public when it's time.
黄金时期(1970- 1995)：企业不断成长，连续盈利(至少5个季度后)适时上市。
Since late August, it's also been pretty easy to track Zuckerberg through a new Facebook feature called Places, which allows users to mark their location at any time.
从八月底，使用Facebook新的地点追踪功能就可以很方便的知道扎克伯格的行踪，这个功能可以让用户在任何时间标注自己的所在地供朋友查看。
If you open up multiple conversations, they will appear in separate columns, making it easy to keep track of more than one discussion at a time.
如果用户打开了多个对话，他们会出现在不同栏目里。
At the time of this writing (November 2007) Apple had sold a whopping 100 million iPods, and is on track to ship more than 200 million iPods by the end of 2008 and 300 million by the close of 2009.
在写这本书时(2007年11月)苹果已经售出了超过1亿台iPod，这个数字在2008年末有望超过2亿，并在2009年结束时超过三亿。
He successfully brought the two sides together to hammer out a deal in 2006. The memorial, at any rate, is on track to be finished in time for the tenth anniversary of the attacks in 2011.
2006年他成功的促使双方达成了协议，不管怎么样，纪念馆可以按计划赶上2011年恐怖袭击的10周年纪念。
We created a director track for each camera and then switched them one at a time to export them which I'll come onto in a minute.
我们为每一个相机创建了一个指导轨迹，同时转换它们就会一一呈现出来。
For example, when preparing a meal we often have to keep track of several tasks at once and make sure we perform each one correctly and at the right time.
例如，当我们准备一顿饭时，会立刻想起几项任务，而且确定每件事情做好。
The 'companion' can then track the phone's GPS to see where their loved one is at any time, while the app will periodically show a button on the user's home screen asking 'Are you OK?
然后这位“同伴”就可以跟踪手机的GPS随时了解他们爱的人所在的位置，而同时应用会定时在用户的主屏幕上显示一个按钮，询问“你还好吗？” 。
It was very important to move safely forward, one step at a time, checking with our client that we were progressing on the right track, in order to avoid unfocused work.
将图模型安全地向前移动很重要，一次一个步骤地操作，及时向我们的客户确认我们进展的操作的轨迹的正确性，这样可以避免不必要的工作。
At a later time I will discuss track conditions.
稍后的时间我讲讨论赛道驾驶的情况。
At last, a feasible real-time image object recognition track algorithm is concluded in the thesis.
最后提出了一种可行的实时图像识别、跟踪算法。
They were the only athletes on the track at the time, making it a truly bizarre sight.
当时跑道上只有她们四位，看上去真的很奇怪。
Do not track what kind of life emerged by chance, it always followed the emergence of certain laws, ready, at an appropriate time there, it becomes a miracle.
没有哪一种生命的轨迹是偶然出现的，它的出现总是遵循着某些规律，准备好了，在一个恰当的时机出现了，就变成了奇迹。
Do not track what kind of life emerged by chance, it always followed the emergence of certain laws, ready, at an appropriate time there, it becomes a miracle.
没有哪一种生命的轨迹是偶然出现的，它的出现总是遵循着某些规律，准备好了，在一个恰当的时机出现了，就变成了奇迹。
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