密度小的物质向上浮动并形成一层皮。

Less dense substances move upwards to form a crust.

《牛津词典》

他在一个为无家可归的人准备的叫做皮内拉斯希望的帐篷里沮丧不安，这个帐篷是天主教堂在清水镇建立的，离萨拉·索塔沿海岸线向上50公里。

He wound up in a tent in a camp for the homeless called Pinellas Hope, which was set up by the Catholic church in the town of Clearwater, 50 miles up the coast from Sarasota.

youdao