Here are common examples you'll run into across the difficulty levels:
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简单讲，要做L3，需要先做L2积累数据。那么要做L4，也一样依赖L3的数据。技术上他们是一脉相承的，不存在一口就能吃个胖子的技术路线。
John Lewis shop staff, including those working in Waitrose, will receive a pay rise on 1 April, bringing their hourly rate to £13.25, or £14.80 in London.