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。
Such differences include what the token is attached to (thread, subject), in which direction it is propagated (downstream, horizontal), and what it is used for (authentication).
这些区别包括令牌附加的对象(线程、主题)、传播的方向(下游、水平)、以及使用它的目的(身份验证)。
A second roller is disposed in a downstream side of the printing area in the first direction, and is adapted to transport the printing medium in the first direction.
第二辊，其在所述第一方向上布置在所述打印区域的下游侧，并适于在所述第一方向上传输所述打印媒介；
Tip vortex goes downstream outward along the span direction, and the induced drag of the wing decreases.
翼尖涡沿着展向方向向外移动，机翼诱导阻力减小。
Tip vortex goes downstream outward along the span direction, and the induced drag of the wing decreases.
翼尖涡沿着展向方向向外移动，机翼诱导阻力减小。
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