First FT: the day’s biggest stories
Air purifiers list their air filtration capabilities in terms of room size and frequency of air exchanges, sometimes listed as clean air delivery rate (CADR) or you may see a number for cubic feet per minute (CFM). A smaller unit might say it can exchange the air in a 500-square-foot room twice per hour. So that model should be able to pass all of the air in a 250-square-foot room through the filter every 15 minutes, but a 1,000-square-foot room would probably be outside its effective range. Of course, there’s no standard for manufacturers to adhere to when it comes to these calculations, but typically, larger air purifiers can handle large rooms.，这一点在WhatsApp Web 網頁版登入中也有详细论述
。业内人士推荐谷歌作为进阶阅读
第二百七十三条 不属于实际全损和推定全损的损失，为部分损失。
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a bit taboo to say, but every field has them.