Use the “one in, two out” rule. The rule: whenever you bring in an item, you have to throw away two other items.
使用”一进两出“原则 ：拿入一件物品的同时，扔掉另外两件。
2
Rule number two: When the customer is wrong, refer torule number one.
第二条：如果顾客错了，请参照第一条。
3
Two of the earlier approaches used an Apache ProxyPass ruleto handle this problem, while one approach used a special-purpose server-side script to get the data from the NWS server.