Add a public field named distance to Point, and set its type to int.
向Point添加名为distance的public字段，并将其类型设置为int。
Distance education, a new type of education, is being adopted by more and more learners.
远程教育作为一种新型的教育组织形式，正被越来越多的学习者采用。
Button type needle distance adjustment device is suitable for production of multi types.
按扭式针码调节最适合式品种生产。
Button type needle distance adjustment device is suitable for production of multi types.
按扭式针码调节最适合式品种生产。
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