n
1 person who binds books; bookbinder 装订工.
2 machine that binds harvested corn into sheaves, or straw into bales 割捆机.
3 cover for holding sheets of paper, magazines, etc together 活页夹.
4 substance (eg bitumen, cement) that makes things stick together 黏合剂.

n

[C]
a removable cover for holding loose sheets of paper, magazines etc
[C]
a person or machine that fastens the parts of a book together
[U and C]
a substance that makes things stick together
[C]AmE
an agreement in which you pay something to show that you intend to buy some property