鳥糞一種主要由海鳥或蝙蝠的排泄物構成的物質，在某些海岸或山洞中不斷積累，用做肥料
A substance composed chiefly of the dung of sea birds or bats, accumulated along certain coastal areas or in caves and used as fertilizer.
海鳥每年都要從一個地方遷徙到另一個地方。
Seabirds will fly from here to another place for migration every year.
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