Message book

1、IP地址（Internet Protocol Address）是互联网上用于识别设备的数字地址。

　　The 5000m event requires extremely high physical fitness of athletes. From a physiological point of view, to achieve a championship pace, the cardiorespiratory function must be strong enough to provide sufficient oxygen to the body, and the muscle strength and endurance must also be able to withstand the pressure of high-speed running. At the same time, excellent rhythm and speed distribution ability are also key. World champions are often able to skillfully distribute their physical strength in the game, maintaining a steady pace in the early stages, and then standing out with their strong sprinting ability in the later stages.

3、IP地址通常分为两种类型：IPv4和IPv6。

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