The top-down approach is about decomposing business elements (mainly business processes and use cases) and refining them into a granularity that makes sense for services.
自顶向下方法旨在分解业务元素（主要是业务流程和用例），然后将它们细化为适合服务的粒度。
Its various divisions cover commodities trading, oil exploration and refining, fertiliser manufacturing and distribution, chemicals and financial services.
其各个部门涵括了商品交易，石油的勘探和炼制，化肥的生产和销售，化工以及金融服务。
He also pointed to Groupon and Twitter as other examples of successful companies whose founders got their starts early but also spent years refining their services.
他还指出，高朋(Groupon)和Twitter也是创始人早早起步但花多年时间精心打造的成功案例。
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