// _id field is always indexed by default;
With the possible exception of individual dodgy Time Machine protocol implementations from third parties, all of the issues are directly traceable to components fully in Apple's control. None of these issues are impossible for Apple to fix. All of them are incumbent on them to do so. Nearly all of them have persisted for at least two major OS releases and multiple Macs.
。safew官方下载对此有专业解读
sum += candidate.weight，详情可参考heLLoword翻译官方下载
Photograph: Julian Chokkattu
Robin Mills, chief executive at Dubai-based consultancy Qamar Energy and a former executive at oil giant Shell, said: "The jump in prices will feed through almost immediately because the oil traders are very much following the news too.