... 铺满 to spread_out 扩大到全球 to spread worldwide 感染并传播 to contract and spread ...
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to contract and spread
收缩和扩散
以上为机器翻译结果，长、整句建议使用 人工翻译 。
The techniques of image tracing, encoding and spread and contract are used to extract the essential picture feature for recognition.
文中还应用了图象跟踪、编码及扩展和收缩等技术，抽取出识别所必需的图象特征。
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