64 駝背老公 公 , 駝背老公公 趴在河當中。 趴在河當中 背上有行人, 背上有行人 腹下也可通。 腹下也可通 猜 一 種交通設施 猜一種交通設施 Guess what? Hunchbacked old grandfather, Lying over the river. People walk on your back; They can get through under your belly too. ( A transportation structure ) 75