Instead, you bought this separate little device called a " luggage carrier" and you put your pieces of luggage on that.
相反,您购买了这个称为“行李架”的独立小装置,然后将行李放在上面。
英语百科
Luggage carrier
A luggage carrier, also commonly called a rack, is a device attached to a bicycle to which cargo or panniers can be attached. This is popular with utility bicycles and touring bicycles.
Bicycle luggage carriers may be mounted on the front or rear of a bicycle. The rear mount is more common. Racks on the front are mostly reserved for utility and freight bicycles. A special type of front rack is a low rider which is mainly used for bicycle touring.