However, in general when the two nodes are in separate message flows (for example, Figure 2), you need to forward the necessary correlation information to the reply flow yourself.

然而，在一般情况下，当两个节点在单独的消息流中时(例如，图2)，您需要自己将必要的相关性信息转发给应答流。

youdao

Asynchronous programming can sometimes be a hassle and I understand if developers sometimes omit the callback references just to keep the control flow more straight-forward.

异步编程有时候非常麻烦，我明白开发人员有时候忽略回调引用，是否只是想让控制流能更加直截了当一些。

youdao

Listing 1 shows a code sample for the forward flow control mechanism, using the implicit application variable.

清单1给出了使用隐式变量application的forward流控制机制的代码示例。

youdao

If a natural gas producer can enter five-year-forward contracts, why can't a dairy farmer smooth out his cash flow by linking feed and milk prices?

FORBES: Creative destruction 101

With Villa struggling to keep hold of the ball, United continued to flow forward and a sliding Park was inches away from converting Rooney's enticing right-wing cross.

BBC: Aston Villa 0-0 Man Utd