An extensive dome-shaped or platelike perennial cover of ice and snow that spreads out from a center and covers a large area,especially of land.是什么意思_An extensive dome-shaped or platelike perennial cover of ice and snow that spreads out from a center and covers a large area,especially of land.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句