您要查找的是不是：
- Each bridge performs a calculation to determine its cost to the root bridge. 每一个桥执行一个计算去确定到根桥的花费
- This page will explain how a root bridge is selected in an STP network. 小节将说明在一个STP网路中，根桥接器是如何被选出来的。
- There can be only one root bridge per bridged network. 每一个桥接的网路中只可以有一个根桥接器。
- At the bootup, all of the bridges think of themselves as the Root Bridge. 在引导启动阶段,所有的网桥把自己看作根网桥。
- In this state, switches determine if there are any other paths to the root bridge. 在这个状态，交换器会决定是否有任何其他路径可以通到根桥接器。
- At the bootup,all of the bridges think of themselves as the Root Bridge. 每个网桥与其他网桥有一个连接线路。
- Second, if the inferior BPDU arrives on the Root Port, all blocked ports become potential alternative paths to the Root Bridge. 第二，如果这个有问题的BPDU到达了我的根端口，那么我的所有阻塞端口都将变成潜在的到达根的备选路径。
- First, if the inferior BPDU arrives on a blocked port, the Root Port and other blocked ports on the switch become alternative paths to the Root Bridge. 重新找一条到根的路径，这不难。最大的问题在于，我自己必须要有去往根的备选路径才行。那么什么情况，我有备选路径呢？其实主要有两情况，如下：
- The first decision that all switches in the network make, is to identify the root bridge. The position of the root bridge in a network affects the traffic flow. 在网路中的所有交换器所做的第一个决定是指定根桥接器。而网路中根桥接器的位置将会影响网路流量。
- These values have been calculated on an assumption that there will be a maximum of seven switches in any branch of the spanning-tree from the root bridge. 这些值是在一种假设下所计算出来的，假设从根桥接器衍伸的任何扩充树的分支最多有七个交换器。
- If the segment is attached to the root bridge, it has a cost of 0.For example, if the data has to travel over three 10 Mbps segments to reach the root bridge, the cost is 200 (100 + 100 + 0). 如果数据是根网桥产生的，那么花费就是0，如果经过了三个网段抵达根网桥的话，那么花费值就是200（100+100+0）。
- It is vain to attempt to root out heresy by force. 试图用暴力消除异端邪说是徒劳的。
- And the suspension bridge from hanging vines. 悬索桥受到了悬挂着的藤的启发。
- The frail wooden bridge cracked. 这座不牢固的木桥断裂了。
- The gardener tore up the plant, root and all. 园丁把园中的花草树木连根全挖了出来。
- I have not the least idea about how to play bridge. 我一点儿不知道怎样打桥牌。
- The plant has not struck root yet. 那棵植物还没生根。
- As the day was wet we stopped in and played bridge. 由于下雨，我们没出去，在家打桥牌。
- I think I'm lost; I can't find the bridge. 我想我是迷路了，我找不到那座桥了。
- Unhappiness is the root cause of his illness. 不开心是他生病的根源。
