await sleep(1000 * attempts); // exponential-ish backoff
TechRadar has reported that this could be Apple's biggest laptop launch in years, with potential initial shipments hitting 8 million units. The price is likely to be somewhere in the $699 to $799 range, which is pretty nifty. However, I'd still go for an Air at $999. They are absolute workhorses.
，这一点在新收录的资料中也有详细论述
Code, Data, Media，详情可参考新收录的资料
Whether you have carpeted floors, hard floors, pets, or shoes that always seem to bring in dirt, this vacuum is built to handle it all. It comes with three different attachments for cleaning high, low, and all the annoying little places, as well as a wall dock and charger for easy storage.