rust; metal oxides formed by oxidation on a surface

(bound form) belly; stomach; the part of the body between the chest and the pelvis

short in length or duration; brief

(bound form) wing of a bird or insect; also refers to objects that resemble wings

(bound form) any of various medium-sized songbirds of the thrush family, such as the 乌鸫 wū​dōng (common blackbird)