illustration of vector birthday template with colorful balloons and happy birthday text 藝術 背景 壁紙 向量生日快樂
This is clipart converted and broken apart that has been released into the public domain because the document says so, and its from NASA, a USA government agency. The publication is called "The Brain in Space:" http://www.nasa.gov/audience/foreducators/topnav/materials/listbytype/The.Brain.in.Space.html 美國國家航空航天局 空間 科學 58294main_The.Brain.in.Space-頁面-97-免費-浮