☊ 碧瓏司の→ßeℒongŚ

🎁 MP3音檔 (按右鍵可下載聽)：
http://online1.tingclass.net/voaspe/…/20161221sa_science.mp3

🎁 中英文稿：
You may have spotted V-shaped squadrons of geese heading south this fall. But for many migrants—like smaller songbirds—nighttime is the right time, when it comes to migration. Winds are gentler. And darkness helps them avoid airborne attacks. Of course darkness also makes it harder for us to see them. Which is where weather radar comes in.
今年冬天你會發現擺成V行隊的飛往南方的鴻雁.但是,對於許多遷徙的動物而言——如一些小的鳴禽——在遷徙的時候，夜晚是合適的時間。風更加柔和。同時黑暗幫助它們避免遭遇空中襲擊。當然，黑暗也增加了我們在黑夜看見它們的難度。這也就氣象雷達的所用之處。
"These radars were designed to detect water drops in the air, precipitation in the air." Jeff Buler, an ornithologist and aeroecologist at the University of Delaware. "They also detect any other large object that will reflect back radio energy. It essentially sees insects and bats and birds as large drops of water."
“這些雷達是用來檢測空氣中的水珠、空氣懸浮物。”Jeff Buler 是德拉瓦大學的鳥類學家和空氣學家。“這些雷達還可以檢測了可以反射無線能量的其他大型物體。它會把昆蟲和鳥類視為大型的水滴。”
Buler and his team used three weather surveillance radars to track migratory birds near the Great Lakes—observing four spring migrations in a row. And what they found was, as the night migration ended, and dawn broke, many birds in flight over the lakes turned back. Decided to quit for the day. Which meant crowded real estate on the south shore of the lakes, as the birds piled up there to wait out the day.
Buler和他的團隊使用了三個氣象監視雷達跟蹤五大湖附近的候鳥——連續觀察四個春季遷徙。最後研究結果發現，晚上遷移結束後,破曉時分,許多鳥兒在湖泊上方的鳥兒就會轉身。決定白天放棄飛行。這就意味著，鳥兒白天在這裡等待一天，五大湖的南岸房地產緊張啊~
The study is in the journal The Auk.
該研究結果發表在《海雀》雜誌上。
The message for conservators? "Restoring one hectare of forest along the shoreline of Lake Michigan might be able to support more migrants than a hectare of forest 50 km away from the shoreline." Because birds—just like humans—like that lakefront property.
“對於保護者這是什麼意思呢?”恢復1公頃的沿湖岸的森林可能會幫助鳥類遠離海岸多飛行50千米。因為鳥類——跟人類一樣——也喜歡海景別墅呢。
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