Pyrokomane
4-吡喃酮
🗣️ 情景例句
She was sick so the didn't attend her classes.
她生病了，所以没上学。
Perseverance is failing nineteen times and succeeding the twentieth.
十九次失败，到第二十次获得成功，这就叫坚持。
Oh dear! What a terrible cough!
噢，宝贝！咳得还真厉害呢！