A country reporting zero cases over a period of 14 consecutive months is believed to have interrupted transmission.
人们认为，一个国家的零病例报告连续达到14个月就属于阻断了疾病传播。
Transmission gear shift part USES single whirlpool and double whirlpool shift, exchange frequency conversion, in order to obtain consecutive speed.
传动变速部位采用单蜗、双蜗变速，变速均匀连续。
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