periodic line的用法和樣例：
例句
- Each class of traffic is prioritized, so the higher priority queues are first in line for borrowing resources during periods of link congestion or over subscription.
信息流量的每一類是被規定了優先等級，在鏈路擁擠或使用過度時，隊伍中優先權更高的排隊首先借用資源。 - If the lines of a Multilink connection fall below the following percentage of capacity for the following period of time, reduce the connection by one line.
減少多鏈路連接的一條線路，如果線路佔用小於其容量的下列百分比。
