Материалы по теме:
Немецкий чиновник отказался участвовать в выборах и выиграл их14:47
Фото: Sofiia Gatilova / Reuters，这一点在新收录的资料中也有详细论述
Carbon dioxide is what humans and pets breathe out. Elevated levels can cause dizziness and lethargy. But no air purifier can reduce CO2 levels because the molecules are so small. Plants can help to some extent, but really the only solution is opening a window or otherwise ventilating the space.
。新收录的资料对此有专业解读
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
“When you transition from selling something from a physical product to a digital product,” Shiller explained, “it allows the seller, the publisher to restrict resale, they can prevent you from reselling the item, and that ends up being very profitable, particularly for the types of goods that people grow tired of.” This suggests that companies selling these goods have a strong incentive to find ways to distribute products where people can’t resell it, with digital distribution a great way to accomplish this. Resale markets tend to disappear in these markets as a result, he added: “I think it’s more hidden rather than acknowledged.”，这一点在新收录的资料中也有详细论述