他们有大量的负载能力在一个小信封，可以预装的准确定位和稳定的齿轮。
They have a large load capacity within a small envelope, and can be preloaded for accurate and stable positioning of the gears.
IP地址就好像经纬度，有了他你就可以准确定位地球上任一个地点，而域名就好像地址。
The IP address is like the GPS coordinates of your house, which you can locate any location once you have it, whereas the domain name is like the address of your house.
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