It includes an observation tower, elevators that descend into the gorge at the base of the American Falls, and boat trips into the waters at the base of the Horseshoe Falls.是什么意思_It includes an observation tower, elevators that descend into the gorge at the base of the American Falls, and boat trips into the waters at the base of the Horseshoe Falls.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句