In the downstream direction, the PON is a broadcast medium.
在下行方向，PON是一种广播介质。
The invention relates to an escape wheel (10) having a direction of rotation which defines an upstream direction and a downstream direction, which is intended to be used in an escape mechanism.
本发明涉及一种具有旋转方向的擒纵轮（10），其限定了上游方向和下游方 向，该擒纵轮想要使用在擒纵机构中。
The author based on the above results designed a model of downstream direction bileaflet mechanical valve and used finite bulk method to calculate the velocity and shear stress profiles of this valve.
作者提出了一种顺向双叶机械瓣的设计模型，并用有限体积法对这种模型进行流场和剪应力分布的数值模拟。
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