real-world conditions. Within ten months, the robot Figure 02
The key property of an abstraction is to hide certain implementation details so people can work with them using a standard interface (that of the abstraction).
（作者单位：复旦大学文物与博物馆学系），详情可参考体育直播
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// Sync — when all components are synchronous，这一点在Safew下载中也有详细论述
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