必须首先创建一个缓冲区，先填充它，然后将位置倒回起始点，这样才能从头读。
You first must create the buffer, fill it, then rewind the position to the beginning so you can read from the start.
设计器工具是从建模器取得定义BPMN业务流程作为起始点。如果你希望从头开始，你能够决定设计一个从头开始的业务流程。
The designer tool takes a BPMN business process defined in the modeler as starting point or you can decide to design a business process from scratch if you want to.
设计器工具是从建模器取得定义BPMN业务流程作为起始点。如果你希望从头开始，你能够决定设计一个从头开始的业务流程。
The designer tool takes a BPMN business process defined in the modeler as starting point or you can decide to design a business process from scratch if you want to.
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