观察组下肢深静脉彩色脉冲多普勒（CPD）返流持续时间（PTR）、股总静脉PTR、朋静脉PTR明显大于对照组（均P<0.001）。
Using CPD, the PTRs of deep vein in lower limbs, femoral common vein and popliteal vein were remarkably larger than those in control group(all P< 0.001) .
因此测量火山灰流的电荷量能够帮助科学家们更好的对火山灰的行动路线以及持续时间做出预判。
Measuring a plume's charges could therefore help scientists better estimate where the ash will go and how long it will stay aloft.
作为世界上一流的海豚权威专家，她研究海豚长达25年，她的研究是持续时间最长这类水下研究——野生海豚计划的一部分。
As the world's leading authority on the species, she has been studying the dolphins for 25 years as part of the Wild dolphin Project, the longest-running underwater study of its kind.
数据流限制控制每一个数据流的速率和持续时间。
Flow limits control the rate and duration for each data flow.
持续时间，有更多的数据进行解码，在视频流比。
Time duration, there is much more data to decode in the video stream than in.
计算结果表明，在船体的水平加速度较大时，通道出口冷却剂的温度与流场的变化很大，但持续时间较短。
The result shows that the coolant temperature and velocity fields in the channel vary significantly when the horizontal acceleration is big, but the variation time is short.
规则可基于事件、事 件的组合、事件的持续时间、与事件相关的持续时间来对音频流或音 频流的部分进行分析。
The rules may analyze an audio stream or a portion of an audio stream based upon an event, a combination of events, the duration of an event, or a duration relative to an event.
采用YA-16多闪光高速摄影反相拍摄导爆管经过不同的消爆空间后出口流场的动态结构，以及出口火焰在持续时间内的累积照片，从有利于点燃延期药的角度出发，对出口流场进行了研究。
Many photographs of out let flow field and flame after different decay space were presented by use of YA-16 high speed camera with multi-flashes in an opposite photograph and time accumlate camera.
采用YA-16多闪光高速摄影反相拍摄导爆管经过不同的消爆空间后出口流场的动态结构，以及出口火焰在持续时间内的累积照片，从有利于点燃延期药的角度出发，对出口流场进行了研究。
Many photographs of out let flow field and flame after different decay space were presented by use of YA-16 high speed camera with multi-flashes in an opposite photograph and time accumlate camera.
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