where have you traveled with your friends
歧途末路 Where the Trail Forks
我有一个梦想:民主斗士马丁·路德·金(英汉双语) I Have a Dream
我熟悉的野生动物 Wild Animals I Have Known
寻觅生物起源:生物学家达尔文(英汉双语) Where Do All These Things Come From