Beijing's new international airport to be put into operation in 2019 will serve 72 million passengers annually.
北京将于2019年投入运行的新国际机场每年将为7200万乘客提供服务。
Notice that the client operations and the callback operation should be put in separate interfaces.
注意，应将客户端操作和回调操作分别安排在不同的接口上。
As the PUT operation is idempotent, it can be retried if the result is unclear without causing unwanted effects (in this case, submitting the same order twice).
由于PUT操作具有幂等性，因而如果结果不清可以进行重试，且不会有副作用(此情形相当于提交同一订单2次)。
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