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The depth of field of a lens is its ability to keep in focus objects of varying heights or objects located at various distances from the camera.

一个镜头之景深使其能够于不同高度目标物或目标物处于由摄像机不同距离时保持在焦。

Vopt is a disk defragmenter that includes batch and scheduled defragmentation options to keep your disk performance at an optimal level and can show information and statistics for file usage, fragmentation, and more all combined in a visually rich yet compact environment. It offers advanced features to override NTFS packing style, exclusion of large files and specific paths, as well as strategic placement of file to improve defragmentation speed.

硬 盘长时间安装软件或者删除文件变的凌乱，这样不仅硬盘存取资料速度变慢也会影响系统效率，虽可以利用Windown内附的磁盘整理程序来整理硬盘，但速度并不是很快，想找其它Windown用的磁盘整理程序取代，Vopt可将分裂在硬盘上不同扇区的文件快速和安全的重整，帮你节省更多时间。

Filo和杨致远博士 candidates in Electrical Engineering at Stanford University, started their guide in a campus trailer in February 1994 as a way to keep track of their personal interests on the Internet.

考生在电工在史丹福大学，开始了他们在引导校园拖车1994年2月作为一种方式跟踪他们的个人利益放在因特网上。

Yahoo! SearchThe two founders of Yahoo!, David Filo and Jerry Yang, Ph.D. candidates in Electrical Engineering at Stanford University, started their guide in a campus trailer in February 1994 as a way to keep track of their personal interests on the Internet.

雅虎！的两位创始人大卫费罗和杨致远博士先后考上了斯坦福大学电机系，在1994年2月走上了他们的奋道路，这期间是在校园车间里度过的，而这一切都作为了保持他们对互联网的兴趣的一种方式。

Keep your fingernails short and clean at all times.

让您的指甲短和清洁在任何时候。

Keep a fire extinguisher at homeand in your car.

在你的家里和车里都要配备灭火器。

Remember to keep first-aid medicine kit close at hand all the time.

切记要把急救药箱一直带在身边。

To keep earning enough money, Fitzgerald wrote short stories and novels at a rapid speed.

保持足够的钱赚钱，菲茨杰拉德短篇小说和写小说的速度迅猛。

Opium was not illegal at this time and from 1871 to 1905 the amount of opium imported into Australia increased fivefold to keep up with consumption.

鸦片是不违法的，在这个时候，从1871年至1905年的数额鸦片进口到澳大利亚增加了五倍，以保持与消费。

On this theory, a framework is designed which can change the spinal position but to fix the ring position to have a fixedness balloon heightness, through which the spinning tension can keep stability ,at the same time, all kinds problem during spinning course can be reduced and the yarn quality can be assured.

在这个理论基础上，我们设计了一套通过改变锭子位置而钢领板位置不变的装置来使气圈的高度不变，从而达到纱线张力的稳定，从而减少成纱过程中因为张力问题而产生的各种问题，减少断纱，提高了成纱品质。

And Pharaoh spoke to Joseph, saying, Your father and your brothers have come to you.

47：5 法老对约瑟说，你父亲和你弟兄们到你这里来了。

Additionally, the approximate flattening of surface strip using lines linking midpoints on perpendicular lines between geodesic curves and the unconditional extreme value method are discussed.

提出了用测地线方程、曲面上两点间短程线来计算膜结构曲面测地线的方法，同时，采用测地线间垂线的中点连线和用无约束极值法进行空间条状曲面近似展开的分析。