Spiraster
旋星體
??? 情景例句
I don't believe you.
我不相信你的話。
I am not sure such data does exist.
我不確定是否有這樣的資料存在。
This is because they had no natural enemies until the arrival of humans and therefore did not need to develop flying wings.
這是因為人類到達這里之前，這些鳥沒有天敵，因此，它們不需要發(fā)育飛行的翅膀。