As we mentioned, sticking the device as close to the middle of the room is helpful for getting the best performance. That means you’ll be looking at it a lot, so design considerations matter. Most purifiers are cylindrical towers with fan vents up top. Units meant for larger rooms are not small, weighing between 12 and 20 pounds and reaching two feet tall (or in the case of the Dyson Purifier Cool, three and a half feet). Some, like Coway’s Airmega IconS, take on more furniture-like designs to blend in. Others, like Dyson's, are conspicuously designed to stand out.
“绿色奇迹”中显韧劲，一茬接着一茬、前赴后继地干。。新收录的资料是该领域的重要参考
整部文集可以在乔布斯档案馆以及苹果图书商店免费获取，官网地址：https://stevejobsarchive.com/publications。新收录的资料对此有专业解读
The guards rise again: the force still shaping Iran。关于这个话题，新收录的资料提供了深入分析
// 单调栈：存储索引（而非值），栈内索引对应的nums值保持「单调递减」