正电子放射层析系统（PET）是科学研究的强有力的工具。

PET has become a powerful tool for scientific studies.

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在地震层析研究中，常常涉及地震波在非均匀介质中的传播路径问题，故快速射线追踪是不可缺少的工具。

The problem of the seismic wave travel path in the nonhomogeneous medium is often mentioned in seismic sequence analysis by means of rapid ray tracing.

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正电子放射层析技术(PET)是科学研究强有力的工具。

Positron Emission Tomography (PET) has become a powerful tool for scientific studies.

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