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；
In the downstream direction, the PON is a broadcast medium.
在下行方向，PON是一种广播介质。
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