In other cases a future and a promise are created together and associated with each other: the future is the value, the promise is the function that sets the value – essentially the return value (future) of an asynchronous function (promise).
在其他情况下，future和promise是一起创建的，并且相互关联：future是值，promise是设定值的函数——本质上是异步函数（promise）的返回值（future）。