When mechanical energy density is variable with time in an object, the mechanical energy flow is bound to follow the transmission of mechanical energy.

物体中机械能密度随时间变化时，伴随着机械能的传递，将存在机械能流。

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Following with mechanical energy transmission in medium, mechanical energy flow will be produced when the density of mechanical energy varies with time.

物体中机械能密度随时间变化时，伴随着机械能的传递，存在机械能流。

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This paper introduces a new concept-mechanical energy flow, studies stress tensor in energy flow and an application of mechanical energy density conservative points in dynamical systems is discussed.

本文介绍了力学中的一个新概念机械能流，研究了能流中的应力张量，并讨论了动力学系统中机械能密度守恒点的一个应用。

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The escapement is the crucial component of a mechanical watch, controlling the flow of energy through the movement and producing that familiar ticktock sound.

WSJ: Watch Making's Self-Taught Genius | Michael Clerizo on George Daniels