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During four weeks of the summer, the saguaros bloom at night to attract visitors.
在夏季的4個星期里，弁慶柱在晚上開花，吸引了不少拜訪者。
The pollen and nectar with which these flowers are loaded, attract long-nosed and long-tongued bats.
這些花中裝滿了花粉和花蜜，吸引了長鼻蝠和長舌蝠。
The bats left Mexico a few days earlier to escape the heat of summer
蝙蝠數日前離開墨西哥以躲避酷暑
and are on their way north to the southern United States.
正向北飛往美國南部
To get there, they have to cross the Sonoran Desert.
要想到達那里，它們必須穿越索諾蘭沙漠。
But the desert is so big that for most of the year they would be unable to cross it.
不過這片沙漠很大，它們一年中大部分時間都無法穿越這里。
Now, with the saguaro in bloom, they can refuel on the way.
現在，有了正在開花的弁慶柱，它們便能在旅途中得到休整。
So the saguaro's success in developing a way to store water
看來弁慶柱進化出的這種成功的儲水方式，
is now crucial to most of the animals that live or even travel through this land.
如今已關系到大部分在此生活和旅行的動物。
The scarcity of rain determined the shape of this icon of the desert.
缺少雨水的環境塑造了這些沙漠中的圖標
But water, scarce though it is, has also, like the wind, shaped the land itself.
盡管水很少，但它也和風一樣，造就了各種地形。
