Indeed, the purple colour extracted from a snail was once so costly that in society at the time only the rich could afford it.
的确，从蜗牛身上提取的紫色物质曾经非常昂贵，在当时的社会，只有富人才能买得起。
You can see or do something a million times, but you can only see or do it for the first time once.
你可以看到或者尝试去做一件事很多很多次，但是你初次看到或者初次尝试的机会只有一次。
Our shower stays pretty nice all the time, and I only officially clean it once in a while.
我们的浴室看起来就一直非常整洁，事实上我一段时间内只有打扫一次。
While the history data of DB2 PE is only retained for a short time (hours or days), once data is in the PWH, the data is available for reporting and trend analysis over much longer periods.
尽管DB 2PE的历史数据只保留较短的时间(几小时或几天)，但是一旦数据被保存在PWH中，这些数据便可在很长的时间内用于报告和趋势分析。
When using an object pool, the allocation, initialization, collection, and finalization only occur once, reducing both the memory usage and the processing time that is required.
在使用对象池时，分配、初始化、回收和终结只发生一次，从而减少了内存使用和所需的处理时间。
The fairy appeared, and said: "Four of the gifts remain." choose once more: and oh, remember — time is flying, and only one of them is precious.
这时仙女又出现了，她说：“这里还有四份礼物。再选一次吧。噢，记住时间飞逝，而其中只有一件是珍贵的。”
The problem is that these stable orbits would only exist once you have crossed the threshold of the event horizon, where time and space flow into one another.
问题是，只有曾穿过黑洞视界的临界才会存在稳定轨道，那里时间与空间会流入其他地方。
Once CPU utilization has reached saturation, increased load only increases response time.
一旦对CPU的利用达到饱和，增加的负载只会增加响应时间。
We internally activate many thoughts at once, but we can retrieve only one at a time.
我们能一次激活许多不同的想法，但只能集中注意力思索其中的一个。
Note that the only other time that the lines separate in this graph was once again when the phone was put on the charger and topped up to 100%.
要指出的是，当手机插上充电器并充电充到100%的时候，图表中显示只有在其他时间系统显示的电量和计算得出的电量不相一致。
Being a student, results would only advance once they value time and let time be their bases of result increaseing, especially at the time of dealing with examination.
作为学生，只有惜时如金，把时间作为提高学习成绩的坚实基础，学习成绩提升才有可能，尤其是应试阶段。
Once you've gotten the spotlight you've only got so much time before someone else will want it, so don't ramble on too much.
一旦你得到了发言的机会，成了聚焦点，在别人打断插话之前的这段时间就属于你，你要好好把握，不要讲太多闲话。
Colonel Fitzwilliam had called at the parsonage more than once during the time, but Mr. Darcy they had only seen at church.
在这段时间里，费茨威廉到牧师家来拜望过好多次，但是达西先生却没有来过，他们仅仅是在教堂里才见到他。
Rows are only locked at the point in time that a cursor is positioned on them; once the next row is fetched, the lock is released.
数据行只是在游标定位它们时才锁定，一旦获取下一行之后，锁将被解除。
once more: and oh, remember--time is flying, and only one of them is precious.
噢，记住时间飞逝，而其中只有一件是珍贵的。
For your slideshow, the images are much larger - 500 pixels wide each - so you show only one image at a time. Once you're done making your changes, skin.css will look like Listing 2.
在我们的幻灯片中，图像大得多(宽500像素)，所以应该每次只显示一个图像。
Content adapters retrieve data only once each time they are run, so most of them must be run periodically to retrieve data.
内容适配器在运行时只检索一次数据，因此大部分的内容适配器必须周期性地运行来检索数据。
As security exits are only invoked at channel startup time, security exits are ideal for performing functions that only need to be done once.
由于仅在通道启动时调用安全出口，安全出口对于执行只需执行一次的功能非常理想。
Code transmission happens only once, whereas data must be transmitted every time you encounter a validation problem at the other end.
代码传输只会发生一次，但每次在另外一端遇到验证问题时都要传输数据。
Installation tasks only occur once, at image-building time, and the installed software becomes a permanent component of the image.
安装任务只在构建映像时运行一次，然后安装的软件就成为映像的永久组件。
This gives you the flexibility to add libraries at run time while still only having to update the information once.
这使您具有在运行时只需要更新信息一次就可以增加库的灵活性。
Post a visible reminder that this job is only temporary. When I once worked in a job I hated, I helped bide my time by hanging a reminder on my bulletin board that said, "this is only temporary."
醒目地标示这只是一个临时工作当我做令自己讨厌的工作时，我等待时机的方式就是在电子告示牌上挂上提示：“这只是临时的。”
This offers a great opportunity to do things once only rather than doing them each time the relevant instructions are executed.
这提供了一个很好的机会，可以只执行一次操作，而不必每次都执行相关指令。
After all, you'd have to be right every time, whereas, the hacker, with infinite patience to probe your defenses, only has to be right once.
毕竟您必须每次都正确，而黑客在耐心攻破您的防御时，只需要对一次就行了。
She: Now listen to me, 'cause I'm only gonna say this once: if I catch you another time playing computer games, you will be in big trouble mister!
她：现在听我说，因为我此次只是想说：如果我下次抓到你打游戏，你的麻烦就大了！
She: Now listen to me, 'cause I'm only gonna say this once: if I catch you another time playing computer games, you will be in big trouble mister!
她：现在听我说，因为我此次只是想说：如果我下次抓到你打游戏，你的麻烦就大了！
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