VOA慢速英语:纳撒尼尔·霍桑的《胎记》

chemical - adj. of or relating to chemistry

chemicals – n. elements found in nature or made by people; substances used in the science of chemistry

imperfection - n. a small flaw or bad part

visible - adj. able to be seen

birthmark - n. an unusual mark that is present on the skin from the time when someone is born