The physical foundation of the ultrasonic waves is presented. A contactless ultrasonic sensor in seam tracing is developed.

介绍了超声波的物理基础，研制了焊缝跟踪中的非接触超声波传感器。

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The influence of weight training on the athletes physical performances was investigated by a series of tracing tests.

运用追踪测试的方法考察了负重训练对运动员运动能力的影响。

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Tracing the physical location of phishing sites that impersonated pages from U.K.-based Barclay and Halifax banks, F-secure's researchers found that they were hosted on the same Russian server used for distributing Storm in recent weeks.

FORBES: Storm For Rent

In the process of helping him find his family, we engaged the NGO world at large and discovered that refugee family tracing was predominantly carried out via pen and paper and physical archives not connected to a searchable grid, and with very little technology taken into account.

FORBES: Uniting Refugees in an Unconventional Way: Lessons Learned