P. h.
[医] 过去病史
🧩 词语组成解析
[医] 普朗克氏量子常数
🗣️ 情景例句
it's exactly as it was when we were married!
它跟我们结婚的时候一模一样！
The problem has been bothering me for weeks.
那个问题已经困扰了我几个星期。
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。