结论彩色多普勒超声检查是诊断睾丸扭转的首选辅助检查，早期诊断及手术探查可以提高睾丸的存活率。
Conclusion Color doppler ultrasound is the first choice in assistant diagnosis of testicular torsion. Earlier diagnosis and operations research could improve the testicular survival rate.
高动态环境会造成较大的多普勒频移，这使得一般的GPS接收机在没有外界辅助的情况下难以可靠工作。
High dynamic environment may cause a large Doppler shift, thus the general GPS receiver is difficult to work reliably without outside assistance.
高动态环境存在较大的多普勒频移，这使得普通的GPS接收机在没有惯导辅助的情况下很难可靠工作。
There is great Doppler frequency shift under high dynamic circumstances, thus the common GPS receiver cannot work reliably without the help of inertial navigation devices.
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