a thing or person that is used instead of another thing or person; to use sth. or someone instead of another thing or person
a group of words in a fixed order that have a particular meaning that is different from the meanings of each word understood on its own
a short piece of writing on a particular subject, especially one done by students as part of the work for a course
essay
n. 文章;散文
substitute
n. 代替者; 代用品 vt. 用……代替……
idiom
n. 习语;成语