a man who is not a member of the clergy (= religious leaders, especially Christian priests, ministers, etc.) but who belongs to a religious group, especially a group living together in a monastery, and who does simple work for the group, such as preparing food

After mass a lay brother offered to take us on a tour of the church. 弥撒结束后，一位男役工提出带我们参观教堂。

Brother Cook serves as lay brother, working the kitchen and bringing food to those in seclusion. 库克弟兄是役工，主理厨房，并给隐修士送饭。