G469
[医] β-吡啶醛缩氨硫脲
🗣️ 情景例句
Sign here, where I've indicated.
签在这里，在我指的地方。
An ounce of prevention is worth a pound of cure.
预防胜于治疗。
The clouds had come down so suddenly we had no warning.
乌云突然出现，我们丝毫没有觉察。