The air is rare at high altitudes.高处空气稀薄.Bottoming out near Heron Island, a manta ray can hit much higher altitudes too.可以在鹭鸶岛附近潜至最深处的鬼蝠魟,其实可以更上一层楼.The space shuttle can orbit at altitudes of up to 965 kilometers.这架航天飞机最...
The Niagara Falls is one of the natural wonders of the world.尼亚加拉瀑布是世界天然奇景之一.Niagara Falls is one of the greatest marvel in the world.尼亚加拉瀑布是世界大奇景之一.Niagara falls is a noble sight.尼亚加拉瀑布是一壮观的景色....
Rainfall had dislodged debris from the slopes of the volcano.雨水冲走了火山坡面上的岩屑。There were two passes over 13,000 feet but the slopes were gentle.有两个超过13,000英尺的山口，但坡度平缓。Many slopes are rock fields with sparse vegetation.许多山坡都...