求翻译：在实际工程中，我们经常会看到一种传动机构——平面四杆机构，其他的杆件机构都是在其基础上演化而来。曲柄摇杆机构作为其基本形式之一，应用非常广泛，其重要性不容忽视。作为一种传动机构，我们在对其进行研究时候，首先考虑的便是其传动性能。对于曲柄摇杆机构，其传动性能的优劣标志参量是传动角γ，传动角越大，其传动性越好；反之，则越差。是什么意思？

In the actual project, we often see a drive mechanism - the flat four institutions, other bar organizations are evolved on its basis. Crank-rocker mechanism as one of its basic form, the application is very broad, its importance can not be ignored. As a transmission mechanism, we study time in its f

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In the actual project, we can see frequently to one transmission system - - plane four pole organizations, other member organization all is evolves in its foundation.The crank rocker organization took one of its fundamental modes, the application is extremely widespread, its importance is not allow

In practical engineering, we often see a transmission--Planar four-bar linkage mechanism, other member institutions are evolved at its base. Rocker as one of its basic form, application is very extensive, its importance should not be overlooked. As a drive mechanism, we study it in time, consider fi

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