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As spring progresses, the ice and snow of the northern forest zone melts.
春天繼續前行，北方森林地區的冰雪開始融化。
The layer of permafrost beneath prevents water draining away.
下面的永凍土層阻止了水的流失。
And the area becomes a vast wetland.
這一地區變成了大片的濕地。
Finland alone is home to 200,000 lakes.
光芬蘭就有二十萬個湖泊。
These are rich in food and a prime location for nesting birds.
這里食物豐富是鳥類筑巢的絕佳地點。
A haunting call echoes through the morning mist. Red-throated Divers.
幽靈般的叫聲在晨霧中縈繞。是紅喉潛鳥。
They've just flown inland from the coast to take advantage of the lake's bounty and to nest.
它們剛從海邊飛到內陸來，利用湖區的豐富資源，并在此筑巢。
Their plaintive of wail serves as a mating call and helps them claim a territory.
這種哀號是交配的信號，同時宣稱領地的歸屬權。
Courtship is beautifully choreographed, a synchronized swim.
求愛儀式像是經過精美的編排，一種同步的水上舞蹈。
Intruders are threatened and chased away.
入侵者受到威脅、被趕走。
Even in this place of plenty, a choice territory is worth a battle.
就算在這樣富足的地方，好的領地也值得用戰斗去維護。
