It lets you track message at certain points in their life cycle by invoking custom code from user exits while the message is passing through the message flow.
它允许您在消息通过消息流传递时调用用户出口中的自定义代码，从而在消息生命周期中的某个点跟踪消息。
Like a rock that fails to stem the river in its flow, so the death of a loved one should not stop life in its stride.
就像一块石头，它不能阻止江河的流动一样，心爱人的死亡不应当阻止你大踏步地前进着的生活。
The two concepts are different: income is the flow of money a nation or household receives in a year; wealth is the stock of assets it has accumulated over its life so far, minus its debts.
这两个概念是有区别的：收入指的是一个国家或者一个家庭一年内所获得的资本流量；而财富指的是在除去负债以后，到目前为止，个体在一生之中所积累的财产存量。
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