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docs/en/src/subscription.md
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# Subscription
The definition of the subscription root object is slightly different from other root objects. Its resolver function always returns a [Stream](https://docs.rs/futures-core/~0.3/futures_core/stream/trait.Stream.html), and the field parameters are usually used as data filtering conditions.
The definition of the subscription root object is slightly different from other root objects. Its resolver function always returns a [Stream](https://docs.rs/futures-core/~0.3/futures_core/stream/trait.Stream.html) or `FieldResult<Stream>`, and the field parameters are usually used as data filtering conditions.
The following example subscribes to an integer stream, which generates one integer per second. The parameter `step` specifies the integer step size with a default of 1.

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# 订阅
订阅根对象和其它根对象定义稍有不同，它的Resolver函数总是返回一个`Stream`，而字段参数通常作为数据的筛选条件。
订阅根对象和其它根对象定义稍有不同，它的Resolver函数总是返回一个 [Stream](https://docs.rs/futures-core/~0.3/futures_core/stream/trait.Stream.html) 或者`FieldResult<Stream>`，而字段参数通常作为数据的筛选条件。
下面的例子订阅一个整数流，它每秒产生一个整数，参数`step`指定了整数的步长，默认为1。