layman
/-mən; -mən/ n
(pl -men / -mən; -mən/)
1 person who does not have an expert knowledge of a subject 外行; 门外汉
a book written for professionals and laymen alike 为专业人员和外行人写的书.
2 Church member who is not a clergyman or priest 普通教徒（有别於神职人员）. layman => lay2.