名词
1. Tar is a binder for gravel in paving.
在铺路时柏油用来黏结砾石。
1. 活页夹
A binder is a hard cover with metal rings inside, which is used to hold loose pieces of paper.
1. 活页夹
A binder is a hard cover with metal rings inside, which is used to hold loose pieces of paper.
