Switches increases the number of collisions domains in the network
交换机增加网络中的冲突域数量（即交换机可分割冲突域）
Switches that
are configured with VLANs will reduce the size of the collision domains by
increasing the number of collision domains in a network
配置了VLANS的交换机在网络中通过增加冲突域数量来降低冲突域的SIZE
but making them smaller
than that of one big,flat network.
但只是把一个大的网络中的冲突域变的小了而已
（小到成为一个端口或VLANS）
大概意思就是这样
不敢说一定是这样