n. a person or thing that takes or can take the place of another
n. an athlete who plays only when a starter on the team is replaced
v. put in the place of another; switch seemingly equivalent items
v. be a substitute
n. 代理, 代理人, 代用品, 代替者, 代替物
vt. 代替
vi. 替代, 取代, 代用
a. 代替的, 代用的, 代用品的
[计] 置换; 替代