Striver
n. 奮斗者
??? 情景例句
When do you need the money?
你什么時候需要錢？
It's nothing.
小事情。
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，它們不需要發育飛行的翅膀。