You can start at the top — the design level, lay out your overall vision and then gradually drill down and implement the components (services).

可以从顶层，即设计层开始，布置整体构想，然后逐渐地深入并实现各个部件(服务)。

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The bill requires all companies listed on the Paris stock exchange to gradually implement changes that put women in 20 percent of their board seats within 18 months, and 40 percent within four years.

该法案要求，在未来18个月内，巴黎证交所名单上的所有公司董事会成员中女性比例达到20%，4年内将该比例提升至40%。

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The tests will fail, I'll implement the methods, and gradually they'll go green again.

这时单元测试会无法通过，我将会实现测试所针对的方法，最终让单元测试可以绿灯通过。

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