Before conclusion about a causal relationship about melatonin and the shyness, a more complete study is needed. After all, the result of the study is invalid and probably misleading.

• 感觉你的开头结尾方式和我很像哦!整个文章不错；就是感觉最后一个攻击点不太好；另外第二个攻击点没有详细地展开.