The problems range in difficulty and for many the experience is inductive chain learning.

欧拉计划的题目难度不一，对于大多数人来说，解题就是一个逐渐学习的过程。

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I remembered learning about the food chain in the 7th grade.

我记得在七年级时学过有关食物链的知识。

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Suppliers and distributors will also ride down the learning curve, making the whole value chain more efficient.

供应商和分销商也有，从而使整个价值链都更加有效。

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Mothercare, which also owns the Early Learning Centre chain, has been scaling down its presence on the UK High Street as part of its turnaround plan, and now has only 269 stores, compared with 311 last April.

BBC: Mothercare UK High Street sales continue to fall

The government has implemented recommendations from those thinkers that have ranged from changing how they do supply chain management to introducing childhood development learning centers in schools.

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Learning to dance in the chain of the 500 or so studios of Kathryn and Arthur Murray seemed as properly American as drinking Coca-Cola or buying a Ford car.

ECONOMIST: Kathryn Murray