Petn
[医] 四硝酸戊赤藓醇[酯], 四硝酸戊四醇[酯], 长效硝酸甘油
🗣️ 情景例句
I think I'm quite proficient in both written and spoken English.
我认为我在英语读写方面相当熟练。
The worst misfortunes are these that never hzppen.
最大的不幸是害怕不会发生的不幸。
Look at those black clouds. It's going to rain.
看那成堆的乌云，要下雨啦！