While there is no one-size-fits-all life cycle that is appropriate for all services and all organizations, a typical service development life cycle has five main stages
虽然并没有适合所有组织和所有服务的万用生命周期模式，不过，服务开发生命周期通常都具有五个主要的阶段
The main reason is that in the early stages of development, you don't know how much work you really have for a story.
主要原因是在开发的早期阶段，您并不了解您需要为某个描述完成的实际工作量。
Early leaf development is artificially divided into three main stages: the initiation of leaf primordium, the establishment of leaf adaxial-abaxial polarity, and the expansion of leaf blade.
早期叶片发育包括三个主要过程：叶原基的起始，叶片腹背性的建立和叶片的延展。
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