如果选择将出站目的地重新用于入站服务，那么消息将自动从入站服务流向出站服务。
If we reuse the outbound destination for the inbound service, the message will automatically flow from the inbound service to the outbound service.
当然，公司并不是完全自由地在箭头4a和箭头4b中选择现金的流向。
Of course, the choice between arrows 4a and 4b is not completely free.
工程上对调节阀流向的选择存在误区，文章就此作了详尽的解释。
There being an incorrect cognition on choice of control valve flow direction in the engineering circle, an elaborate explain pointing to this problem is presented.
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