All letters must be stamped with the correct postage.
任
信件
应该按所需邮资贴邮票。
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During each of the 20,000 or so breaths that you take every day, air molecules float back and land on mucus-covered tissue the area of a couple postage stamps, they're packed with about 40 million special scent-detecting nerves.
在每天大约20000次
呼吸中,空气分子漂浮回粘液覆盖
组织上,这
两张邮票
面积??,它们含有大约4000万种特殊
气味检测神经。
冒险之旅