Enteramine
血清素, 5-羟色胺
🗣️ 情景例句
He is still unable to express himself in English.
他仍然不能用英语表达自己的意思。
This part of the country is very mountainous.
国家的这部分有很多的山。
For all his life, he had known that people suddenly disappeared from their villages.
他一生中，听说过有的人突然间在他们的村庄失踪了。