Bdnf
abbr. 脑源性神经营养因子
🗣️ 情景例句
That's relief.
真令人欣慰。
I wonder whether he's telling the truth.
我不知道他说的是不是实话。
This is because they had no natural enemies until the arrival of humans and therefore did not need to develop flying wings.
这是因为人类到达这里之前，这些鸟没有天敌，因此，它们不需要发育飞行的翅膀。