binders

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一个割草机，它会割断庄稼并将其捆扎起来。

You can use egg as a binder.

你可以用鸡蛋作为粘合剂。