Fluorizating agent
[化] 氟化剂
🧩 词语组成解析
🗣️ 情景例句
One apple. Two apples. Three apples. Four apples.
一个苹果。两个苹果。三个苹果。四个苹果。
If the pills were pleasant, they would not be gilded.
丸药不苦不会加糖衣。
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。