table runner       
noun [ C ] uk/ˈteɪ.bəl ˌrʌn.ər/ us/ˈteɪ.bəl ˌrʌn.ɚ/ (also runner)
 桌旗,(纵贯桌面的)长条装饰桌布
a strip of material that is put along the length of a table, for decoration
  I bought a set of napkins with a matching table runner. 我买了一套餐巾和一条配搭的长形装饰桌布。 
 We made a table runner from an oddment of fabric.  我们用一块边角布料做了一条长形装饰桌布。 
 - More examples
 - I prefer to use a table runner and big mats instead.
 - Smaller items such as table runners are a way of introducing colour to your dining room.
 - Wooden instruments, Christmas placemats, and table runners are just some of the gifts that will be for sale at the markets.