Lao Yang was born in a small town. He liked reading when he studied at school. He thought the writers were respected and could get a lot of money. He wrote a lot of stories and posted them to the editorial departments (编辑部) but didn’t receive any answers. Now he works in a factory. He’s busy at work. When he’s free, he always reads something. He always remembers he hoped to be a writer when he was young. One day, Xiao Ping, his ten-year-old daughter, came back. She looked worried and某几何体的三视图如图所示,则它的体积是 .