I first saw this picture on facebook page, here: www.facebook.com/photo.php?fbid=327080537338010&set=a.249775228401875.58533.156624514383614&type=1&theater Unknown author.
騎自行車給人民。車到垃圾桶。
bike、black and white、bycicle、car、stencil、trash
自行車、黑與白、自行車、汽車、模版、垃圾
資料來源：openclipart ( https://openclipart.org/ )