Acetylfluoride
乙酰氟
🗣️ 情景例句
You should have seen the look on his face
真该看看他脸上的表情
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。
Sun Huifang.
孙惠芳。