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.
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