Do they only belong and serve for certain people in certain time?
它们是否只存在于某些特定时间，服务于特定人群？
The classroom teaching is conducted in certain time and limited space.
课堂教学是在一定的时间和有限的空间中开展的。
Methods of EOQ and ordering different kinds of cargo in certain time are used in stock management.
在库存管理部分应用了经济订货 批量方法以及多品种定期订货方法。
Second, in certain facilities, a large number of people use it in certain time periods, while few of people use it in other time periods.
第二，在部分场馆，有些时间段使用人数较多，而其他时间段使用人数较少甚至闲置。
Some graphs of surface movement and distortion can be shown also when working face is advanced with different mining speed in certain time.
能够作出在一定时间内不同开采速度条件下的地表移动变形曲线。
Assets evaluation refers to a series of economic activities to determine the value of assets through estimation in certain time and for certain point.
资产评估是指通过对资产的某一时点价值的估算，从而确定其价值的经济活动。
This situation is mainly reflected in two aspects: First, in certain time, a lot of people use some facilities, while few of people use other facilities.
这种情况主要体现在两个方面：第一，在部分时间段，有些场馆使用人数较多，而其他场馆使用人数较少甚至闲置。
The system can maintain one or a plurality of test data wires in the high level state in certain time according to the instructions of the automatic test equipments.
本发明可根据自动测试设备的指令维持一条或多条测试数据线在一定时间内的高电平状态。
At a certain time in the morning, the tape player would play soft music with a low and sweet voice of a young girl, "Wake up, please."
在早上的某个时间，录音机会播放轻柔的音乐，一个年轻女孩低沉而甜美的声音从录音机里传来：“请起床。”
At the same time, appearance is still important in certain circumstances and then we must choose our clothes carefully.
与此同时，外表在某些情况下仍然是重要的，然后我们必须仔细选择我们的衣服。
Some spacecraft may have problems while in space after a certain amount of time.
一些宇宙飞船在太空中停留一段时间后可能会出现问题。
I did a study several years ago, asking procrastinators to finish a task in a certain period of time.
几年前我做过一项研究，要求拖延者在特定时间完成一项任务。
In some places, you may borrow as many books as you want, but in others you are limited to a certain number of books for several weeks so that you can have enough time to finish all the books you've borrowed.
在一些地方，你可以想借多少书就借多少，但在其他地方，你只限于借阅一定数量的书几个星期，这样你可以有足够的时间读完所有已借的书。
For testing, you should grab a database dump of your production environment from a certain point in time so that you have something to test with.
为了测试，您应该从您的生产环境的某个时点抓取一个数据库转储，以便您拥有可以测试的数据。
Now this can be a great thing in certain circumstances, but not all the time.
现在，在某些情况下鲁莽还不错，但并不是每时每刻都行。
It allows the system to answer questions about what was known at a certain point in time about a fact at another moment.
它使系统可以回答在某一特定时间点，对于在另一时刻的事实，系统知道什么的问题。
What is perhaps a more certain result of Hawking's time in Canada is that scientists there - particularly young ones - will be inspired by his presence.
霍金在加拿大的时候，比较明确的结果也许在于那里的科学家——特别是年轻的科学家——会因他的到来而受到鼓励。
That allows gas stations to say they don't accept 50- or $100 bills after a certain time of day in hopes of not getting robbed.
这使得加油站有权利不接受50或100的货币，以避免在某些时候遭受打劫。
In certain situations, Metronome's short pause-time guarantees are insufficient for an application's rt characteristics.
在某些情形下，Metronome的短暂停时间保证不能满足应用程序的RT特征。
The program, which he called Mail Goggles, intercepts e-mails sent using Google's e-mail service, Gmail, after a certain time in the evening.
他把这个程序称为“邮件眼镜”，在晚上某个时间段后，它可以拦截通过谷歌电子邮件服务系统（即Gmail）发送的邮件。
If no response is received from a worker in a certain amount of time, the master marks the worker as failed.
如果某个worker响应超时，master把worker标识为故障。
For example, the remote machine might not be found, it might not respond in a certain amount of time, a message sent to or from the service could be lost or delayed, and so forth.
例如，可能会找不到远程机器、远程机器可能没有在一定的时间内响应、发送到服务或从服务发送来的消息可能被丢失或发生了延迟等等。
So instead of calculating the time spent looking in a certain direction, researchers could take into account a baby's first glance, he added.
所以，除了计算他们直视某个方向所花的时间，研究者们也要将婴儿第一眼所看到的这个因素考虑进去。
Every time I get before an audience to share my family's story, I turn to the relationship I have formed with my mother in a certain way over time.
每当我站在一位听众面前与他分享我的家庭故事，很快我就求助于我以某种方式与母亲形成的关系。
Every time I get before an audience to share my family's story, I turn to the relationship I have formed with my mother in a certain way over time.
每当我站在一位听众面前与他分享我的家庭故事，很快我就求助于我以某种方式与母亲形成的关系。
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