A special feature of the maps are the curves of constant umbral eclipse duration,i.e., totality, which are plotted within the path at 1 min increments.是什么意思_A special feature of the maps are the curves of constant umbral eclipse duration,i.e., totality, which are plotted within the path at 1 min increments.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句