What is the physical mechanism of the propagation of sound waves?

声波传播的物理机理是什么？

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The physical mechanism of nonlinear polarization rotation mode-locking was analyzed in theory.

理论分析了利用非线性偏振旋转效应锁模激光器的机理。

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Research on the physical mechanism of this process will supply theoretic foundation for prevention of such accident.

研究这一过程发生的物理机理可以为预防发生此类事故提供理论依据。

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The first mechanism involved "rather crude and perhaps humiliating physical examinations, " which soon gave way to mouth swabs to collect chromosomes, the IAAF said.

CNN: IAAF urges caution over Semenya intersex claims