Pentose nucleic acid (pna)
[化] 戊糖核酸
🧩 词语组成解析
n. [生化]戊糖
a. 核的
🗣️ 情景例句
He gives his harness bells a shake
摇动， 绳上的铃铛
I think it's going to rain tomorrow.
我认为明天将会下雨。
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。