binder

a leather/plastic binder

皮质／塑料活页夹

The way to harvest cereals 50 years ago was to use a binder, that cut the crop and tied it up in sheaves.

50年前收割谷物的方法是使用收割机，它会切割庄稼并把它捆绑成捆。

You can use egg as a binder.

你可以使用蛋作为粘合剂。