Start with the bird itself: a sea bird so large that its wings, opened out, are longer than a person is tall. It is heavy, it lives far out over the open ocean, and most people go a whole life without seeing one. Two things about that picture get borrowed by the other uses. One is the sheer weight and size — something that big cannot be hidden or put down. The other is how rare the sighting is — an albatross is the thing you almost never get.
From the word’s history
The source records the name as uncertain: probably from Spanish or Portuguese alcatraz (pelican, gannet), possibly going back to an Arabic word meaning the diver, with the spelling later pulled toward Latin albus, white. That last pull is why the bird is so often described as the white one.
來源不確定。資料上說可能來自西班牙文或葡萄牙文的 alcatraz（鵜鶘、鰹鳥），再往上也許是阿拉伯文裡「潛水的那個」。後來拼法受到拉丁文 albus（白色）影響，所以字首才寫成 alb-。這也呼應了字典裡總是說牠是「白色的大海鳥」。
Wiktionary (kaikki) entry for albatross, source_ref kaikki:3f6f69a190036ae4:703095395
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