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This is Africa's Mount Kenya.
這是非洲的肯尼亞山。
It's 17,000 feet high,
海拔超過五千米
which makes its summit some 30 degrees colder than the surrounding savanna.
峰頂溫度比周圍的熱帶草原低三十度左右。
Giant heathers, lobelias and groundsel grow on its upper slopes.
巨型石南，半邊蓮和千里光，生長在山頂斜坡上。
They all thrive in the tropical sun.
它們在炎炎烈日下茁壯成長。
After all, every day is summer.
畢竟赤道每天都是夏天。
But once the sun sets, every night becomes as bitterly cold as winter.
但一旦太陽下山，每個夜晚都像冬天般寒冷。
The temperature drops to five degrees below freezing,
氣溫降到零下五度，
turning the mountainside into a garden of ice.
山坡變成了冰雪花園。
Everything freezes, but the cabbage groundsels have a way of protecting themselves.
一切都凍結了，但是木本千里光有辦法保護自己。
They close up their leathery leaves to form an insulating blanket that shields their vulnerable central bud.
它們合起革質葉片形成一道保溫層，以保護中心脆弱的蓓蕾。
