Feedback is a focal point and difficult point that we analyse and design circuit. Thispaper set forth every judge method of feedback type.

反馈类型的判断和引入是电路分析和设计的重点和难点，本文就各种反馈类型的判断方法进行了详细的阐述。

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For a long time, the forest product sale decision has been the focal point and difficult point in the management of forestry business in China.

长期以来，林产品营销决策一直是我国林业企业经营管理工作中面临的重点和难点。

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Therefore, integrative practical activities curriculum is a focal point and difficult point in this curriculum reform.

因此，综合实践活动课程也自然成为本次课改的重点、难点。

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However, Glenn Johnson, who founded the truck convoy, believes it will be difficult for the Attleborough-based charity to continue as the lorries were the "focal point of public interest" and the organisation's "main source of income".

BBC: East Coast Truckers