There are traces of sand, mixed with crystals of gypsum. A typical mix picked up from walking the city of Boston.

地板上还有不少混合着石膏结晶的沙粒，这是在波士顿步行不可避免会带上的痕迹。

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Sanya's beach culture originated at Dadonghai, a congested strip of sand near the city center.

三亚海滩文化缘起于大东海，大东海是三亚市区附近一处拥挤、狭长的沙滩。

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This year, a huge circular bore is to be lowered into a layer of sand deep beneath the city, where it will drill a tunnel to link them.

今年，就要在城市地下深处的砂层打通一个巨大的圆形隧道，把地铁站连起来。

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Early in the 16th century, reports of the city on the sand -- then part of the Songhay Empire -- filtered back to Europe through the Moorish diplomat and writer Leo Africanus, adding to the city's near-mythical status as an African El Dorado.

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Haeundae Beach in the east of the city is the most popular, with its attractive sweep of soft sand packed out in summer by enthusiastic locals and young international English teachers.

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In Wichita, Pajor said the city used half of its road-clearing salt and sand in last week's storm.

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