Podocyst
足囊(腹足類)
??? 情景例句
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Living without an aim is like sailing without a compass.
生活沒(méi)有目標(biāo)，猶如航海沒(méi)有羅盤。
This is because they had no natural enemies until the arrival of humans and therefore did not need to develop flying wings.
這是因?yàn)槿祟惖竭_(dá)這里之前，這些鳥(niǎo)沒(méi)有天敵，因此，它們不需要發(fā)育飛行的翅膀。