I enjoy working with children because I was working in a nursery.

nursery 是名词，由动词 nurse（照料、护理）加上后缀 -ery（表示场所）构成，字面意思是"照料幼儿的场所"，即"托儿所"。在英式英语中特指照顾学龄前儿童的机构，美式英语常用 daycare center 表示类似场所。