科学家们认为土卫二冰火山的活跃时间只占其寿命时间的1%到20%，幸运的是，卡西尼号飞越土卫二的时候正好赶上了喷发期。
Scientists believe the cryovolcanism on Enceladus has only been active during 1 to 20 percent of its existence. We’re glad Cassini caught it in an eruptive phase.
目前这个地区已有1200余件刻有文字的文物出土，其中包括涂墙，陶罐，动物骨头和贝壳，其活跃时间大约为公元前600年至公元前400年之间。
Some 1200 inscribed objects have been found, ranging from painted wallsto pots, bones and shells. The date of the script appears to liesomewhere between 600 and 400 BC.
这些地幔柱显然起源于很深的地方，可能深至地核和地幔之间的边界，而且许多都已经活跃了很长时间。
The plumes apparently originate at great depths, perhaps as deep as the boundary between the core and the mantle, and many have been active for a very long time.
他是学校集邮俱乐部的一位活跃会员，将他大部分的空闲时间用在集邮上。
He is an active member of the school's stamp club, devoting most of his sparing time to stamp collecting.
曾经有一段时间，社会压力使威尔士语逐渐消亡，但经过多年的努力，威尔士语现在再次成为威尔士人生活中活跃的一部分。
There was a time when social pressures were killing off the Welsh language, but after years of efforts, it is now an active part of Welsh life again.
第三组被称为黄昏组：他们在黎明和黄昏的微光中茁壮成长，而在其他时间则不活跃。
A third group are known as crepuscular: they thrive in the low light of dawn and dusk and remain inactive at other hours.
他们回答这些问题的时间越长，对所审作品的评价就越高，神经活动也越活跃。
The longer they took to answer these questions, the more highly they rated the piece under scrutiny, and the greater their neural activity.
此外，一个活动的工作流程应该比较简单，这样在特定的时间您就可以了解哪些活动正在活跃地被执行，哪些已经完成，以及哪些还没有开始。
Furthermore, the workflow for an activity should be kept simple, so that at any given time you know which activities are actively being worked, which are complete, and which are not yet started.
这就意味着手机需要定期切换到“活跃”状态，接收需要的数据，然后进入“空闲”状态，随着时间的推移，这些细微的操作总共将消耗大量的电池和网络流量。
So that means the phone has to regularly go active, get the data it needs, then go idle again, and over time all those little transitions add up to a lot of battery life and network traffic.
被动记忆信息的数量并不会影响反应时间，更不会影响到对活跃信息回忆的准确性。
The number of passive items does not influence either response time or accuracy for recalling active items.
如果没有电视你将有更多的时间在一天中保持活跃，同时你也将有更多的时间留给自己或者留给关心的人。
Without TV you will have more time to stay active during the day and you will have more time for yourself or your loved ones.
做出决定之后，我开始活跃于早期社区，花费大量时间在帮助社区上，回答人们的提问解决他们的问题。
After this decision, I started becoming active in the early community, spending a lot of my own time in the help forums, answering people's questions or working through their problems with them.
失恋的时间越久，大脑里与依恋相关的区域里，活跃度就越低。
The more time that had passed since the breakup, the less activity there was in a brain region associated with attachment.
该模型已经活跃了很长一段时间。
举个简单的例子，我身为众多博客的版主，但是我没有时间在那儿活跃。
For example, I'm part of several blogging networks, but I haven't been as active lately as I'd like.
当然很有可能，这些角色和作用会随时间而变化，到目前为止，马克观察到，大多数人似乎仍然保持在自己的角色中，但随着时间的推移减弱，他们变得越来越不活跃。
It's possible that these roles change over time - so far, Marc observes that most people seem to stay in their roles, but attenuate over time, becoming less active.
让你的生物钟来指导你：找出你一天中最活跃、效率最高的时间。
Use your biological rhythms to guide you: locate and utilize the hours of the day you're most active and fruitful.
大自然帮了我们大忙，15世纪早期，碳元素层变化活跃，使我们能缩短时间距离。
Nature worked in our favor. During the early 15th century, radiocarbon levels were changing quite rapidly, so that allowed us to narrow the time frame.
同时，用于特别“活跃”的育儿时间也大幅增长——远远超过这些产品节约的时间。
And the amount of time devoted specifically to "active" childcare has also increased substantially – more than cancelling out any time saved by these products, the report suggested.
可能在这所大学内部有某种持续的秘密传统，这种传统在1650到1670年的20年时间里兴起并非常活跃。
It may be - that there was some continuous esoteric tradition within the University which sprang into activity again in the twenty years from 1650 to 1670.
毕竟我的妻子和孩子都在这个时间段睡觉，所以我也就没那么活跃。
The wife and kids are asleep during that time, so I'm not as active then.
此外，该环境变量还为任何用于登录系统的登录机制，确保在一定时间间隔的不活跃之后自动超时。
Moreover this environment variable ensures auto timeout after inactivity for the interval of time for any login mechanism used to log into the system.
最后，浏览器接收会话持续时间并设置一个超时以保持连接处于活跃状态。
Finally, the browser receives the session duration time and sets a timeout to keep the connection alive.
尽管那听起来很像你的时间表，但有猫腻：除了女儿被传染的短时间睡眠，还有，这个两个家庭成员还非常活跃。
While that might sound a lot like your schedule, there's a catch: Besides catching fewer Z's, the two family members are also very active.
天气凉爽的清晨和太阳渐落的傍晚是观鸟的最有效的时间，因为大部分鸟儿会在此时活跃和喂食，这样就更容易观察到它们了。
Early mornings when the air is still cool and late evenings as the sun is setting are the most effective times to go birding because more birds will be active and feeding, making them easier to see.
一个社区活跃分子给他们的花长时间工作的伴侣创造了新的社会机会。
A partner who is an active community volunteer creates new social opportunities for a spouse who spends long hours at work.
复制收集器的收集周期时间是由活跃对象的数量决定的。
The duration of collection cycles in a copying collector is driven by the number of live objects.
几项一连串证据表明有“生理上的不活跃期”：当你长时间坐着，你的身体实际上正在做对你有害的事。
Several strands of evidence suggest that there's a "physiology of inactivity" : that when you spend long periods sitting, your body actually does things that are bad for you.
几项一连串证据表明有“生理上的不活跃期”：当你长时间坐着，你的身体实际上正在做对你有害的事。
Several strands of evidence suggest that there's a "physiology of inactivity" : that when you spend long periods sitting, your body actually does things that are bad for you.
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