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，这一点在必应SEO/必应排名中也有详细论述
Incense was also used to keep time in China, sometimes with metal balls hanging by threads which would fall into a tray below, acting as gongs. A 19th Century account by an American ethnologisteven noted people in China placing incense sticks between their toes to wake themselves up.
买书不读指南｜《海的呼吸：碳循环与气候演变的海洋史》