与此同时，另一款重要数码产品，手机也开始了更新换代。
mark candidate[n] as used
。Line官方版本下载对此有专业解读
Transforms don't execute until the consumer pulls. There's no eager evaluation, no hidden buffering. Data flows on-demand from source, through transforms, to the consumer. If you stop iterating, processing stops.
政绩之本，在于为民。政绩好不好，人民最有发言权。