The gravity model explicitly relates flows between zones to interzonal impedance to travel.
重力模型明确

地区间
阻抗
将
布量和小区联系起
。
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Android maker Google hasn't responded to our requests for comment, but Facebook says Android users explicitly opt-in for this feature when they download their messenger app or a slim down version of the social network, an app called Facebook Lite.
Android

谷歌没有回应我们的置评请求,但Facebook
示,Android用户在下载他们的应用程序或精简版的社交网络(名为Facebook Lite)时,明
选择了这个功能。
Kim Darroch resigned following the publication of the first tranche of messages last week and after Boris Johnson, the front-runner to be the next British prime minister, refused to explicitly back him. Here is our diplomatic correspondent James Robbins.
上周,第一批信息公布后,金·德里爵士克宣布辞职。在此之前,英国下任首相的热门人选鲍里斯·约翰逊拒绝正面支持他。以下是本台外交通讯员詹姆斯·罗宾斯的报道。