filling
/ˈfɪlɪŋ; `fɪlɪŋ/ n
1 [C] (process of putting in) material used to fill a hole in a tooth （补牙洞的）填料; 补牙
I had to have two fillings at the dentist's today. 我今天要请牙医给我补两颗牙.
2 [C, U] food put between slices of bread to make a sandwich, or between layers of cake, etc 馅
a sponge cake with jam filling 果酱馅饼.